From 84660630787f59635f280255d3375455a8ac0ed8 Mon Sep 17 00:00:00 2001
From: Edmund Farrow <edmund.farrow@ed.ac.uk>
Date: Tue, 28 Jul 2026 16:50:54 +0100
Subject: [PATCH 01/10] api-frontend - Private API initial setup

---
 api/docker/DockerfileFrontendDemo             |    23 +
 ...ocker-compose.demo-private-library.dev.yml |    52 +
 .../docker-compose.demo-private-library.yml   |    39 +
 .../files/private-demo/000-default.conf       |    13 +
 api/private-demo/.gitignore                   |     1 +
 api/private-demo/build_manifest.php           |   136 +
 api/private-demo/lib.php                      |   346 +
 api/private-demo/public/.htaccess             |     4 +
 api/private-demo/public/assets/.gitignore     |     2 +
 api/private-demo/public/embed-question.js     |    47 +
 api/private-demo/public/embed.php             |   121 +
 api/private-demo/public/index.php             |   145 +
 api/private-demo/public/notes.php             |   111 +
 api/private-demo/public/private-demo.js       |    68 +
 api/private-demo/question-manifest.json       | 17848 ++++++++++++++++
 api/public/stackshared.js                     |     9 +-
 16 files changed, 18961 insertions(+), 4 deletions(-)
 create mode 100644 api/docker/DockerfileFrontendDemo
 create mode 100644 api/docker/docker-compose.demo-private-library.dev.yml
 create mode 100644 api/docker/docker-compose.demo-private-library.yml
 create mode 100644 api/docker/files/private-demo/000-default.conf
 create mode 100644 api/private-demo/.gitignore
 create mode 100644 api/private-demo/build_manifest.php
 create mode 100644 api/private-demo/lib.php
 create mode 100644 api/private-demo/public/.htaccess
 create mode 100644 api/private-demo/public/assets/.gitignore
 create mode 100644 api/private-demo/public/embed-question.js
 create mode 100644 api/private-demo/public/embed.php
 create mode 100644 api/private-demo/public/index.php
 create mode 100644 api/private-demo/public/notes.php
 create mode 100644 api/private-demo/public/private-demo.js
 create mode 100644 api/private-demo/question-manifest.json

diff --git a/api/docker/DockerfileFrontendDemo b/api/docker/DockerfileFrontendDemo
new file mode 100644
index 00000000000..2d8735b596e
--- /dev/null
+++ b/api/docker/DockerfileFrontendDemo
@@ -0,0 +1,23 @@
+# This Dockerfile builds a public frontend for the private STACK API demo.
+# It serves the browser UI and privately calls an API container over the
+# Docker network. It does not expose the STACK API routes directly.
+
+FROM php:8.4.5-apache-bookworm
+
+RUN a2enmod rewrite
+
+ENV APACHE_DOCUMENT_ROOT=/srv/stack/api/private-demo/public
+ENV STACK_PRIVATE_DEMO_API_URL=http://api
+
+RUN sed -ri -e 's!/var/www/html!${APACHE_DOCUMENT_ROOT}!g' /etc/apache2/sites-available/*.conf
+RUN sed -ri -e 's!/var/www/!${APACHE_DOCUMENT_ROOT}!g' /etc/apache2/apache2.conf /etc/apache2/conf-available/*.conf
+
+COPY ./api/docker/files/private-demo/000-default.conf /etc/apache2/sites-available/000-default.conf
+COPY / /srv/stack
+
+RUN mkdir -p /srv/stack/api/private-demo/public/assets && \
+    cp /srv/stack/api/public/api.css /srv/stack/api/private-demo/public/assets/api.css && \
+    cp /srv/stack/api/public/stackjsvle.js /srv/stack/api/private-demo/public/assets/stackjsvle.js && \
+    cp /srv/stack/api/public/stackshared.js /srv/stack/api/private-demo/public/assets/stackshared.js && \
+    cp /srv/stack/api/public/logo_large.png /srv/stack/api/private-demo/public/assets/logo_large.png && \
+    test -f /srv/stack/api/private-demo/question-manifest.json
diff --git a/api/docker/docker-compose.demo-private-library.dev.yml b/api/docker/docker-compose.demo-private-library.dev.yml
new file mode 100644
index 00000000000..aa392b66370
--- /dev/null
+++ b/api/docker/docker-compose.demo-private-library.dev.yml
@@ -0,0 +1,52 @@
+# Development version of the private STACK API demo.
+#
+# Only the frontend is exposed to the host. Source is bind-mounted so PHP,
+# JavaScript, CSS, stacklibrary, and API changes are visible without rebuilding.
+services:
+  maxima:
+    image: mathinstitut/goemaxima:2026062900-latest
+    tmpfs:
+      - "/tmp"
+    restart: unless-stopped
+    cap_add:
+      - SETGID
+      - SETUID
+    cap_drop:
+      - ALL
+    environment:
+      GOEMAXIMA_QUEUE_LEN: 32
+    read_only: true
+
+  api:
+    build:
+      context: ./../../
+      dockerfile: ./api/docker/DockerfileDemo
+      target: development
+    restart: unless-stopped
+    expose:
+      - "80"
+    volumes:
+      - ../../:/srv/stack
+      - /srv/stack/api/vendor/
+    depends_on:
+      - maxima
+
+  frontend:
+    build:
+      context: ./../../
+      dockerfile: ./api/docker/DockerfileFrontendDemo
+    restart: unless-stopped
+    environment:
+      STACK_PRIVATE_DEMO_API_URL: http://api
+    volumes:
+      - ../../api/private-demo:/srv/stack/api/private-demo
+      - ../../api/public/api.css:/srv/stack/api/private-demo/public/assets/api.css:ro
+      - ../../api/public/stackjsvle.js:/srv/stack/api/private-demo/public/assets/stackjsvle.js:ro
+      - ../../api/public/stackshared.js:/srv/stack/api/private-demo/public/assets/stackshared.js:ro
+      - ../../api/public/logo_large.png:/srv/stack/api/private-demo/public/assets/logo_large.png:ro
+      - ../../samplequestions/stacklibrary:/srv/stack/samplequestions/stacklibrary:ro
+      - ../../corsscripts:/srv/stack/corsscripts:ro
+    ports:
+      - "3081:80"
+    depends_on:
+      - api
diff --git a/api/docker/docker-compose.demo-private-library.yml b/api/docker/docker-compose.demo-private-library.yml
new file mode 100644
index 00000000000..1dec80f70d3
--- /dev/null
+++ b/api/docker/docker-compose.demo-private-library.yml
@@ -0,0 +1,39 @@
+# This demo exposes only the frontend container. The browser sends question ids
+# to the frontend, and the frontend privately sends question XML to the API.
+services:
+  maxima:
+    image: mathinstitut/goemaxima:2026062900-latest
+    tmpfs:
+      - "/tmp"
+    restart: unless-stopped
+    cap_add:
+      - SETGID
+      - SETUID
+    cap_drop:
+      - ALL
+    environment:
+      GOEMAXIMA_QUEUE_LEN: 32
+    read_only: true
+
+  api:
+    build:
+      context: ./../../
+      dockerfile: ./api/docker/DockerfileDemo
+      target: production
+    restart: unless-stopped
+    expose:
+      - "80"
+    depends_on:
+      - maxima
+
+  frontend:
+    build:
+      context: ./../../
+      dockerfile: ./api/docker/DockerfileFrontendDemo
+    restart: unless-stopped
+    environment:
+      STACK_PRIVATE_DEMO_API_URL: http://api
+    ports:
+      - "80:80"
+    depends_on:
+      - api
diff --git a/api/docker/files/private-demo/000-default.conf b/api/docker/files/private-demo/000-default.conf
new file mode 100644
index 00000000000..119bb36c1b4
--- /dev/null
+++ b/api/docker/files/private-demo/000-default.conf
@@ -0,0 +1,13 @@
+<VirtualHost *:80>
+        ServerAdmin webmaster@localhost
+        DocumentRoot ${APACHE_DOCUMENT_ROOT}
+
+        <Directory ${APACHE_DOCUMENT_ROOT}>
+                Options FollowSymLinks
+                AllowOverride All
+                Require all granted
+        </Directory>
+
+        ErrorLog /dev/stderr
+        TransferLog /dev/stdout
+</VirtualHost>
diff --git a/api/private-demo/.gitignore b/api/private-demo/.gitignore
new file mode 100644
index 00000000000..30b51c238a5
--- /dev/null
+++ b/api/private-demo/.gitignore
@@ -0,0 +1 @@
+question-manifest.json
diff --git a/api/private-demo/build_manifest.php b/api/private-demo/build_manifest.php
new file mode 100644
index 00000000000..7fb6694ae8b
--- /dev/null
+++ b/api/private-demo/build_manifest.php
@@ -0,0 +1,136 @@
+<?php
+// This file is part of Stack - http://stack.maths.ed.ac.uk/
+//
+// Stack is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+/**
+ * Build the private demo question manifest.
+ *
+ * The browser receives opaque question ids from this manifest. Only the
+ * frontend container maps those ids back to stacklibrary XML files.
+ *
+ * @package    qtype_stack
+ * @copyright  2026 University of Edinburgh
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later.
+ */
+
+if (PHP_SAPI !== 'cli') {
+    http_response_code(404);
+    die();
+}
+
+$root = realpath(__DIR__ . '/../../samplequestions/stacklibrary');
+$output = getenv('STACK_PRIVATE_DEMO_MANIFEST') ?: __DIR__ . '/question-manifest.json';
+
+if ($root === false) {
+    fwrite(STDERR, "Could not find stacklibrary.\n");
+    exit(1);
+}
+
+$files = [];
+$iterator = new RecursiveIteratorIterator(
+    new RecursiveDirectoryIterator($root, FilesystemIterator::SKIP_DOTS)
+);
+
+foreach ($iterator as $file) {
+    if ($file->isFile() && strtolower($file->getExtension()) === 'xml') {
+        $files[] = $file->getPathname();
+    }
+}
+sort($files, SORT_STRING);
+
+$questions = [];
+$errors = [];
+$skipped = [
+    'nostack' => 0,
+    'multiple' => 0,
+];
+
+foreach ($files as $file) {
+    $relativepath = ltrim(str_replace('\\', '/', substr($file, strlen($root))), '/');
+    $xml = file_get_contents($file);
+
+    libxml_use_internal_errors(true);
+    $quiz = simplexml_load_string($xml);
+    $xmlerrors = libxml_get_errors();
+    libxml_clear_errors();
+
+    if ($quiz === false) {
+        $errors[] = $relativepath . ': invalid XML';
+        continue;
+    }
+
+    $stackquestions = [];
+    foreach ($quiz->question as $question) {
+        $type = (string) $question['type'];
+        if ($type === 'category') {
+            continue;
+        }
+        if ($type === 'stack') {
+            $stackquestions[] = $question;
+        }
+    }
+
+    if (count($stackquestions) === 0) {
+        // The library contains category metadata and Moodle question types that
+        // are not STACK API questions. They are not part of this demo catalogue.
+        $skipped['nostack']++;
+        continue;
+    }
+
+    if (count($stackquestions) !== 1) {
+        // This demo maps one public id to one library file. Multi-question
+        // bundles can stay in the library, but are skipped here.
+        $skipped['multiple']++;
+        continue;
+    }
+
+    $name = trim((string) $stackquestions[0]->name->text);
+    if ($name === '') {
+        $name = basename($relativepath, '.xml');
+    }
+
+    $id = 'q_' . substr(hash('sha256', $relativepath), 0, 16);
+    if (array_key_exists($id, $questions)) {
+        $errors[] = $relativepath . ': duplicate generated question id ' . $id;
+        continue;
+    }
+
+    $category = dirname($relativepath);
+    $questions[$id] = [
+        'id' => $id,
+        'name' => $name,
+        'filename' => basename($relativepath),
+        'path' => $relativepath,
+        'category' => $category === '.' ? '' : $category,
+    ];
+}
+
+if ($errors) {
+    foreach ($errors as $error) {
+        fwrite(STDERR, $error . "\n");
+    }
+    exit(1);
+}
+
+$manifest = [
+    'root' => 'samplequestions/stacklibrary',
+    'questions' => $questions,
+];
+
+$json = json_encode($manifest, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES);
+if ($json === false) {
+    fwrite(STDERR, "Could not encode manifest JSON.\n");
+    exit(1);
+}
+
+file_put_contents($output, $json . "\n");
+fwrite(STDOUT, 'Wrote ' . count($questions) . " questions to $output\n");
+fwrite(
+    STDOUT,
+    'Skipped ' . $skipped['nostack'] . ' XML files without STACK questions and ' .
+        $skipped['multiple'] . " multi-question XML files.\n"
+);
diff --git a/api/private-demo/lib.php b/api/private-demo/lib.php
new file mode 100644
index 00000000000..7a0d65e264d
--- /dev/null
+++ b/api/private-demo/lib.php
@@ -0,0 +1,346 @@
+<?php
+// This file is part of Stack - http://stack.maths.ed.ac.uk/
+//
+// Stack is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+/**
+ * Shared helpers for the private STACK API demo frontend.
+ *
+ * @package    qtype_stack
+ * @copyright  2026 University of Edinburgh
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later.
+ */
+
+define('STACK_PRIVATE_DEMO_ROOT', realpath(__DIR__ . '/../..'));
+define('STACK_PRIVATE_DEMO_LIBRARY_ROOT', realpath(STACK_PRIVATE_DEMO_ROOT . '/samplequestions/stacklibrary'));
+define('STACK_PRIVATE_DEMO_CORS_ROOT', realpath(STACK_PRIVATE_DEMO_ROOT . '/corsscripts'));
+define('STACK_PRIVATE_DEMO_MANIFEST', getenv('STACK_PRIVATE_DEMO_MANIFEST') ?: __DIR__ . '/question-manifest.json');
+define('STACK_PRIVATE_DEMO_API_BASE', rtrim(getenv('STACK_PRIVATE_DEMO_API_URL') ?: 'http://api', '/'));
+
+/**
+ * Send a JSON response and stop execution.
+ *
+ * @param mixed $data Response data.
+ * @param int $status HTTP status.
+ */
+function stack_private_demo_json($data, $status = 200) {
+    http_response_code($status);
+    header('Content-Type: application/json;charset=UTF-8');
+    echo json_encode($data, JSON_UNESCAPED_SLASHES);
+    die();
+}
+
+/**
+ * Send an error JSON response and stop execution.
+ *
+ * @param string $message Error message.
+ * @param int $status HTTP status.
+ */
+function stack_private_demo_error($message, $status = 400) {
+    stack_private_demo_json(['message' => $message], $status);
+}
+
+/**
+ * Load the question manifest checked into the repository.
+ *
+ * @return array Manifest.
+ */
+function stack_private_demo_manifest() {
+    if (!file_exists(STACK_PRIVATE_DEMO_MANIFEST)) {
+        stack_private_demo_error('Question manifest is not available.', 500);
+    }
+
+    $manifest = json_decode(file_get_contents(STACK_PRIVATE_DEMO_MANIFEST), true);
+    if (!is_array($manifest) || !isset($manifest['questions']) || !is_array($manifest['questions'])) {
+        stack_private_demo_error('Question manifest is invalid.', 500);
+    }
+
+    return $manifest;
+}
+
+/**
+ * Return the public catalogue exposed to the browser.
+ *
+ * @return array Catalogue.
+ */
+function stack_private_demo_catalogue() {
+    $questions = array_values(stack_private_demo_manifest()['questions']);
+    usort($questions, function($left, $right) {
+        return [$left['category'], $left['name']] <=> [$right['category'], $right['name']];
+    });
+
+    return array_map(function($question) {
+        return [
+            'questionId' => $question['id'],
+            'name' => $question['name'],
+            'filename' => $question['filename'],
+            'category' => $question['category'],
+        ];
+    }, $questions);
+}
+
+/**
+ * Decode the current JSON request body.
+ *
+ * @return array Request data.
+ */
+function stack_private_demo_request_json() {
+    $raw = file_get_contents('php://input');
+    $data = json_decode($raw, true);
+    if (!is_array($data)) {
+        stack_private_demo_error('Expected a JSON object.');
+    }
+
+    if (array_key_exists('questionDefinition', $data)) {
+        stack_private_demo_error('questionDefinition is not accepted by this demo.');
+    }
+
+    return $data;
+}
+
+/**
+ * Resolve a question id to a local XML question definition.
+ *
+ * @param string $questionid Opaque question id.
+ * @return string XML question definition.
+ */
+function stack_private_demo_question_definition($questionid) {
+    $manifest = stack_private_demo_manifest();
+    if (!isset($manifest['questions'][$questionid])) {
+        stack_private_demo_error('Unknown question id.', 404);
+    }
+
+    return stack_private_demo_question_definition_from_path($manifest['questions'][$questionid]['path'], true);
+}
+
+/**
+ * Resolve a stacklibrary-relative path to a local XML question definition.
+ *
+ * @param string $relativepath Relative path under samplequestions/stacklibrary.
+ * @param bool $manifestpath Whether the path came from the generated manifest.
+ * @return string XML question definition.
+ */
+function stack_private_demo_question_definition_from_path($relativepath, $manifestpath = false) {
+    if (
+        !is_string($relativepath) ||
+        $relativepath === '' ||
+        str_starts_with($relativepath, '/') ||
+        str_contains($relativepath, '..') ||
+        strtolower(pathinfo($relativepath, PATHINFO_EXTENSION)) !== 'xml'
+    ) {
+        stack_private_demo_error($manifestpath ? 'Invalid question path in manifest.' : 'Invalid question path.', 400);
+    }
+
+    $fullpath = realpath(STACK_PRIVATE_DEMO_LIBRARY_ROOT . '/' . $relativepath);
+    if ($fullpath === false || !str_starts_with($fullpath, STACK_PRIVATE_DEMO_LIBRARY_ROOT . DIRECTORY_SEPARATOR)) {
+        stack_private_demo_error('Question file is not available.', $manifestpath ? 500 : 404);
+    }
+
+    $xml = file_get_contents($fullpath);
+    if ($xml === false) {
+        stack_private_demo_error('Question file could not be read.', 500);
+    }
+
+    return $xml;
+}
+
+/**
+ * Build an API request from a browser request.
+ *
+ * @param array $data Browser request.
+ * @param string $route API route.
+ * @return array API request.
+ */
+function stack_private_demo_api_payload($data, $route) {
+    $questionid = $data['questionId'] ?? null;
+    $questionpath = $data['questionPath'] ?? null;
+    if (($questionid === null && $questionpath === null) || ($questionid !== null && $questionpath !== null)) {
+        stack_private_demo_error('Exactly one of questionId or questionPath is required.');
+    }
+
+    $payload = $data;
+    unset($payload['questionId']);
+    unset($payload['questionPath']);
+    $payload['questionDefinition'] = $questionid !== null ?
+        stack_private_demo_question_definition($questionid) :
+        stack_private_demo_question_definition_from_path($questionpath);
+
+    if ($route === 'render') {
+        unset($payload['answers']);
+    }
+
+    return $payload;
+}
+
+/**
+ * Proxy a JSON POST to the private STACK API container.
+ *
+ * @param string $route API route.
+ * @param array $payload API payload.
+ */
+function stack_private_demo_proxy_json($route, $payload) {
+    $json = json_encode($payload, JSON_UNESCAPED_SLASHES);
+    if ($json === false) {
+        stack_private_demo_error('Could not encode API request.', 500);
+    }
+
+    $headers = [
+        'Content-Type: application/json',
+    ];
+    $language = $_SERVER['HTTP_ACCEPT_LANGUAGE'] ?? '';
+    if ($language !== '') {
+        $headers[] = 'Accept-Language: ' . $language;
+    }
+
+    $context = stream_context_create([
+        'http' => [
+            'method' => 'POST',
+            'header' => implode("\r\n", $headers),
+            'content' => $json,
+            'ignore_errors' => true,
+            'timeout' => 60,
+        ],
+    ]);
+
+    $url = STACK_PRIVATE_DEMO_API_BASE . '/' . $route;
+    $body = file_get_contents($url, false, $context);
+    if ($body === false) {
+        stack_private_demo_error('Private API request failed.', 502);
+    }
+
+    $status = stack_private_demo_response_status($http_response_header ?? []);
+    http_response_code($status);
+    header('Content-Type: ' . stack_private_demo_header_value($http_response_header ?? [], 'Content-Type', 'application/json'));
+    echo $body;
+    die();
+}
+
+/**
+ * Proxy a generated plot/static question asset from the private API container.
+ *
+ * @param string $filename Asset filename.
+ */
+function stack_private_demo_proxy_plot($filename) {
+    $filename = basename(urldecode($filename));
+    if ($filename === '' || $filename === '.' || $filename === '..') {
+        stack_private_demo_error('Invalid asset name.');
+    }
+
+    $context = stream_context_create([
+        'http' => [
+            'method' => 'GET',
+            'ignore_errors' => true,
+            'timeout' => 60,
+        ],
+    ]);
+
+    $url = STACK_PRIVATE_DEMO_API_BASE . '/plot.php/' . rawurlencode($filename);
+    $body = file_get_contents($url, false, $context);
+    if ($body === false) {
+        stack_private_demo_error('Private API asset request failed.', 502);
+    }
+
+    $headers = $http_response_header ?? [];
+    http_response_code(stack_private_demo_response_status($headers));
+    header('Content-Type: ' . stack_private_demo_header_value($headers, 'Content-Type', 'application/octet-stream'));
+    $length = stack_private_demo_header_value($headers, 'Content-Length', '');
+    if ($length !== '') {
+        header('Content-Length: ' . $length);
+    }
+    echo $body;
+    die();
+}
+
+/**
+ * Serve a static helper asset with CORS headers for iframe content.
+ *
+ * @param string $asset Relative asset path.
+ */
+function stack_private_demo_cors_asset($asset) {
+    header('Access-Control-Allow-Origin: *');
+    header('Access-Control-Allow-Headers: *');
+
+    if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
+        header('HTTP/1.0 204 No Content');
+        header('Access-Control-Allow-Methods: GET, OPTIONS');
+        die();
+    }
+
+    if ($_SERVER['REQUEST_METHOD'] !== 'GET') {
+        stack_private_demo_error('Method not allowed.', 405);
+    }
+
+    $asset = ltrim(urldecode($asset), '/');
+    if ($asset === '' || str_contains($asset, '..') || str_starts_with($asset, '/')) {
+        http_response_code(404);
+        echo 'No such script here.';
+        die();
+    }
+
+    $fullpath = realpath(STACK_PRIVATE_DEMO_CORS_ROOT . '/' . $asset);
+    if (
+        $fullpath === false ||
+        !str_starts_with($fullpath, STACK_PRIVATE_DEMO_CORS_ROOT . DIRECTORY_SEPARATOR) ||
+        !is_file($fullpath)
+    ) {
+        http_response_code(404);
+        echo 'No such script here.';
+        die();
+    }
+
+    header('Content-Type: ' . stack_private_demo_mimetype($fullpath));
+    header('Cache-Control: public, max-age=31104000, immutable');
+    readfile($fullpath);
+    die();
+}
+
+/**
+ * Return a MIME type for a public static helper asset.
+ *
+ * @param string $path Asset path.
+ * @return string MIME type.
+ */
+function stack_private_demo_mimetype($path) {
+    $extension = strtolower(pathinfo($path, PATHINFO_EXTENSION));
+    $types = [
+        'css' => 'text/css;charset=UTF-8',
+        'js' => 'text/javascript;charset=UTF-8',
+        'map' => 'application/json;charset=UTF-8',
+        'json' => 'application/json;charset=UTF-8',
+    ];
+
+    return $types[$extension] ?? 'application/octet-stream';
+}
+
+/**
+ * Get the HTTP response status from wrapper response headers.
+ *
+ * @param array $headers Response headers.
+ * @return int HTTP status.
+ */
+function stack_private_demo_response_status($headers) {
+    if (!empty($headers[0]) && preg_match('/\s([0-9]{3})\s/', $headers[0], $matches)) {
+        return (int) $matches[1];
+    }
+    return 200;
+}
+
+/**
+ * Get a response header value from wrapper response headers.
+ *
+ * @param array $headers Response headers.
+ * @param string $name Header name.
+ * @param string $default Default value.
+ * @return string Header value.
+ */
+function stack_private_demo_header_value($headers, $name, $default) {
+    foreach ($headers as $header) {
+        if (stripos($header, $name . ':') === 0) {
+            return trim(substr($header, strlen($name) + 1));
+        }
+    }
+    return $default;
+}
diff --git a/api/private-demo/public/.htaccess b/api/private-demo/public/.htaccess
new file mode 100644
index 00000000000..66ef8f69ce3
--- /dev/null
+++ b/api/private-demo/public/.htaccess
@@ -0,0 +1,4 @@
+RewriteEngine On
+RewriteCond %{REQUEST_FILENAME} !-f
+RewriteCond %{REQUEST_FILENAME} !-d
+RewriteRule ^ index.php [QSA,L]
diff --git a/api/private-demo/public/assets/.gitignore b/api/private-demo/public/assets/.gitignore
new file mode 100644
index 00000000000..d6b7ef32c84
--- /dev/null
+++ b/api/private-demo/public/assets/.gitignore
@@ -0,0 +1,2 @@
+*
+!.gitignore
diff --git a/api/private-demo/public/embed-question.js b/api/private-demo/public/embed-question.js
new file mode 100644
index 00000000000..1cfc926c655
--- /dev/null
+++ b/api/private-demo/public/embed-question.js
@@ -0,0 +1,47 @@
+// This file is part of Stack - http://stack.maths.ed.ac.uk/
+//
+// Stack is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+const embeddedQuestion = window.stackEmbeddedQuestion || {};
+let questions = [{name: embeddedQuestion.name || 'Practice question'}];
+let page = 0;
+let seed = null;
+
+$(document).ready(function () {
+    document.getElementById('stackapi_variant').style.display = 'none';
+    send();
+});
+
+function collectData() {
+    const data = {
+        answers: collectAnswer(),
+        seed: seed,
+        renderInputs: inputPrefix,
+    };
+    if (embeddedQuestion.questionId) {
+        data.questionId = embeddedQuestion.questionId;
+    } else {
+        data.questionPath = embeddedQuestion.questionPath;
+    }
+    return data;
+}
+
+function advanceVariant() {
+    seed = seed === null ? 1 : seed + 1;
+    send();
+}
+
+function toggleAnswer(button) {
+    const element = document.getElementById('stackapi_correct');
+    const status = element.style.display;
+    if (status === 'block') {
+        element.style.display = 'none';
+        button.value = 'Display Correct Answers';
+    } else {
+        element.style.display = 'block';
+        button.value = 'Hide Correct Answers';
+    }
+}
diff --git a/api/private-demo/public/embed.php b/api/private-demo/public/embed.php
new file mode 100644
index 00000000000..0fb9eed2233
--- /dev/null
+++ b/api/private-demo/public/embed.php
@@ -0,0 +1,121 @@
+<?php
+// This file is part of Stack - http://stack.maths.ed.ac.uk/
+//
+// Stack is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+/**
+ * Embeddable single-question frame for the private demo.
+ *
+ * @package    qtype_stack
+ * @copyright  2026 University of Edinburgh
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later.
+ */
+
+require_once(__DIR__ . '/../lib.php');
+
+$questionid = isset($_GET['questionId']) ? trim($_GET['questionId']) : '';
+$questionpath = isset($_GET['questionPath']) ? trim($_GET['questionPath']) : '';
+
+if (($questionid === '' && $questionpath === '') || ($questionid !== '' && $questionpath !== '')) {
+    http_response_code(400);
+    echo 'Exactly one of questionId or questionPath is required.';
+    die();
+}
+if ($questionid !== '') {
+    // Fail early for malformed embed URLs. The API request will still perform
+    // the authoritative manifest lookup.
+    $xml = stack_private_demo_question_definition($questionid);
+}
+if ($questionpath !== '') {
+    $xml = stack_private_demo_question_definition_from_path($questionpath);
+}
+
+$title = 'Practice question';
+libxml_use_internal_errors(true);
+$quiz = simplexml_load_string($xml);
+libxml_clear_errors();
+if ($quiz !== false && isset($quiz->question[0]->name->text)) {
+    $questionname = trim((string) $quiz->question[0]->name->text);
+    if ($questionname !== '') {
+        $title = $questionname;
+    }
+}
+
+$question = [
+    'name' => $title,
+];
+if ($questionid !== '') {
+    $question['questionId'] = $questionid;
+} else {
+    $question['questionPath'] = $questionpath;
+}
+?>
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8"/>
+    <title><?=htmlspecialchars($question['name'])?></title>
+    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
+    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" />
+    <link rel="stylesheet" href="assets/api.css" />
+    <style>
+      body {
+        margin: 0;
+        padding: 1rem;
+        background: #fff;
+      }
+      .main-content {
+        margin-left: 0;
+        padding: 0;
+      }
+      #stackapi_spinner {
+        display: none;
+      }
+    </style>
+    <script
+      type="text/javascript"
+      src="//cdn.jsdelivr.net/npm/mathjax@3.2.2/es5/tex-mml-chtml.js?config=TeX-AMS-MML_HTMLorMML"
+    ></script>
+    <script src="assets/stackjsvle.js"></script>
+    <script>
+      window.stackApiDemoConfig = {
+        serverUrl: '/demo/',
+        displayType: 'SAMPLE'
+      };
+      window.stackEmbeddedQuestion = <?=json_encode($question, JSON_UNESCAPED_SLASHES)?>;
+    </script>
+    <script src="assets/stackshared.js"></script>
+    <script src="embed-question.js"></script>
+  </head>
+  <body>
+    <div class="main-content que stack">
+      <h2 id="stackapi_name"></h2>
+      <div id="errors"></div>
+      <div id="stackapi_qtext" style="display: none">
+        <div id="output" class="formulation"></div>
+        <br>
+        <input type="button" onclick="answer()" class="btn btn-primary noninfo" value="Submit Answers"/>
+        <input type="button" onclick="toggleAnswer(this)" class="btn btn-primary noninfo" value="Display Correct Answers"/>
+        <input id="stackapi_variant" type="button" onclick="advanceVariant()" class="btn btn-primary" value="Next Variant"/>
+        <span id="stackapi_spinner" class="spinner-border text-primary align-middle" role="status" style="margin-left: 10px;">
+          <span class="sr-only">Loading...</span>
+        </span>
+        <div id="stackapi_validity" style="color:darkred"></div>
+      </div>
+      <br>
+      <div id="stackapi_combinedfeedback" class="feedback outcome" style="display: none">
+        <div id="specificfeedback"></div>
+        <div id="generalfeedback"></div>
+      </div>
+      <div id="stackapi_correct" style="display: none">
+        <div class="noninfo">
+          <h3>Correct answers:</h3>
+          <div id="formatcorrectresponse" class="feedback outcome"></div>
+        </div>
+      </div>
+    </div>
+  </body>
+</html>
diff --git a/api/private-demo/public/index.php b/api/private-demo/public/index.php
new file mode 100644
index 00000000000..d7d9f918325
--- /dev/null
+++ b/api/private-demo/public/index.php
@@ -0,0 +1,145 @@
+<?php
+// This file is part of Stack - http://stack.maths.ed.ac.uk/
+//
+// Stack is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+/**
+ * Private STACK API demo frontend.
+ *
+ * @package    qtype_stack
+ * @copyright  2026 University of Edinburgh
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later.
+ */
+
+require_once(__DIR__ . '/../lib.php');
+
+$path = trim(parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH), '/');
+$method = $_SERVER['REQUEST_METHOD'];
+
+if ($path === 'demo/questions' && $method === 'GET') {
+    stack_private_demo_json(stack_private_demo_catalogue());
+}
+
+if ($path === 'cors.php' || $path === 'demo/cors.php') {
+    stack_private_demo_cors_asset($_GET['name'] ?? '');
+}
+
+if (preg_match('#^demo/plot\.php/(.+)$#', $path, $matches) && $method === 'GET') {
+    stack_private_demo_proxy_plot($matches[1]);
+}
+
+if (preg_match('#^demo/(render|validate|grade|download|diff)$#', $path, $matches) && $method === 'POST') {
+    $route = $matches[1];
+    $data = stack_private_demo_request_json();
+    $payload = stack_private_demo_api_payload($data, $route);
+    if ($route === 'diff') {
+        $payload = ['questionDefinition' => $payload['questionDefinition']];
+    }
+    stack_private_demo_proxy_json($route, $payload);
+}
+
+if ($path === 'embed' && $method === 'GET') {
+    require(__DIR__ . '/embed.php');
+    die();
+}
+
+if ($path !== '' && $path !== 'index.php') {
+    http_response_code(404);
+    echo 'Not found';
+    die();
+}
+?>
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8"/>
+    <title>STACK Private API Demo</title>
+    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
+    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" />
+    <link rel="stylesheet" href="assets/api.css" />
+    <style>
+      .question-browser {
+        max-width: 48rem;
+        margin-bottom: 1rem;
+      }
+      .question-browser input,
+      .question-browser select {
+        width: 100%;
+      }
+      .question-browser select {
+        min-height: 16rem;
+      }
+      .question-meta {
+        color: #555;
+        font-size: 0.875rem;
+        margin-top: 0.35rem;
+      }
+      .private-demo-content {
+        margin-left: 0;
+        padding: 1px 16px;
+      }
+      .question-frame {
+        border: 0;
+        min-height: 46rem;
+        width: 100%;
+      }
+    </style>
+    <script src="private-demo.js"></script>
+  </head>
+  <body>
+    <div class="container-fluid que stack">
+      <div>
+        <a href="https://stack-assessment.org/" class="nav-link">
+          <span style="display: flex; align-items: center; font-size: 20px">
+            <span style="display: flex; align-items: center;">
+              <img src="assets/logo_large.png" style="height: 50px;" alt="STACK">
+              <span style="font-size: 50px;"><b>STACK</b></span>
+            </span>
+            &nbsp;| Online assessment
+          </span>
+        </a>
+      </div>
+      <h2>Private API Demonstration</h2>
+      <div class="col-lg-9">
+        <p>
+          This demo serves questions from the STACK library without sending question XML to the browser.
+        </p>
+        <hr>
+      </div>
+      <div id="errors"></div>
+      <div class="question-browser col-lg-9">
+        <input
+          id="question-search"
+          class="form-control"
+          type="search"
+          placeholder="Search by question name or filename"
+          autocomplete="off"
+        />
+        <select id="question-list" class="form-control" size="12"></select>
+        <div id="question-count" class="question-meta"></div>
+      </div>
+      <div>
+        <div class="main-content private-demo-content">
+          <br>
+          <div class="col-lg-10">
+            <iframe
+              id="question-frame"
+              class="question-frame"
+              title="Selected STACK question"
+            ></iframe>
+          </div>
+          <div class="col-lg-9">
+            <hr />
+            <p style="font-size: 0.875em;color:gray;">
+              The STACK source code, including this API, is licensed under the GNU General Public, License Version 3.
+              Documentation, sample questions and materials, are licensed under Creative Commons Attribution-ShareAlike 4.0 International.
+            </p>
+          </div>
+        </div>
+      </div>
+    </div>
+  </body>
+</html>
diff --git a/api/private-demo/public/notes.php b/api/private-demo/public/notes.php
new file mode 100644
index 00000000000..00409d0afb6
--- /dev/null
+++ b/api/private-demo/public/notes.php
@@ -0,0 +1,111 @@
+<?php
+// This file is part of Stack - http://stack.maths.ed.ac.uk/
+//
+// Stack is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+/**
+ * Sample maths notes page with embedded private-demo STACK questions.
+ *
+ * @package    qtype_stack
+ * @copyright  2026 University of Edinburgh
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later.
+ */
+
+$pathquestion = 'Algebra-Refresher/01-Combinations-of-arithmetic-operations/AlgMap-1-1.xml';
+$idquestion = 'q_ae2a68e432c6de1b';
+?>
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8"/>
+    <title>Sample Maths Notes</title>
+    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" />
+    <style>
+      body {
+        background: #f6f7f9;
+        color: #222;
+      }
+      .notes-page {
+        max-width: 62rem;
+        margin: 0 auto;
+        padding: 2rem 1rem 4rem;
+      }
+      .notes-section {
+        background: #fff;
+        border: 1px solid #ddd;
+        border-radius: 6px;
+        padding: 1.25rem;
+        margin-bottom: 1rem;
+      }
+      .stack-embed {
+        width: 100%;
+        min-height: 31rem;
+        border: 1px solid #cfd7df;
+        border-radius: 6px;
+        background: #fff;
+      }
+      code {
+        color: #004f71;
+      }
+    </style>
+  </head>
+  <body>
+    <main class="notes-page">
+      <h1>Integer Arithmetic: Sample Notes</h1>
+      <p class="lead">
+        These notes illustrate how a resource author can combine explanatory material with embedded STACK questions.
+      </p>
+
+      <section class="notes-section">
+        <h2>Adding And Subtracting Integers</h2>
+        <p>
+          Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer non arcu vel justo tincidunt
+          congue. Suspendisse potenti. Curabitur vitae lectus sed lorem fermentum cursus. Donec id
+          risus at turpis dictum tincidunt.
+        </p>
+        <p>
+          When working with signed numbers, it is useful to keep track of the operation and the sign of
+          each number separately. Praesent commodo, sem at pulvinar laoreet, ipsum neque hendrerit
+          lectus, sed posuere risus neque at augue.
+        </p>
+      </section>
+
+      <section class="notes-section">
+        <h2>Embedded By File Location</h2>
+        <p>
+          This embedded question is selected by a stacklibrary-relative file location:
+          <code><?=htmlspecialchars($pathquestion)?></code>.
+        </p>
+        <iframe
+          class="stack-embed"
+          title="STACK question embedded by file location"
+          src="/embed?questionPath=<?=rawurlencode($pathquestion)?>"
+        ></iframe>
+      </section>
+
+      <section class="notes-section">
+        <h2>Embedded By Question ID</h2>
+        <p>
+          This embedded question is selected by the generated manifest id:
+          <code><?=htmlspecialchars($idquestion)?></code>.
+        </p>
+        <iframe
+          class="stack-embed"
+          title="STACK question embedded by question id"
+          src="/embed?questionId=<?=rawurlencode($idquestion)?>"
+        ></iframe>
+      </section>
+
+      <section class="notes-section">
+        <h2>Further Notes</h2>
+        <p>
+          Mauris rhoncus, nunc at tincidunt vulputate, augue arcu tempor enim, ac vestibulum nisl
+          risus non libero. Sed et massa sed lorem dictum facilisis. Aliquam erat volutpat.
+        </p>
+      </section>
+    </main>
+  </body>
+</html>
diff --git a/api/private-demo/public/private-demo.js b/api/private-demo/public/private-demo.js
new file mode 100644
index 00000000000..2c0f2078e72
--- /dev/null
+++ b/api/private-demo/public/private-demo.js
@@ -0,0 +1,68 @@
+// This file is part of Stack - http://stack.maths.ed.ac.uk/
+//
+// Stack is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+const maxVisibleQuestions = 100;
+let questions = [];
+let page = 0;
+
+$(document).ready(function () {
+    fetch('demo/questions')
+        .then((response) => response.json())
+        .then((catalogue) => {
+            questions = catalogue;
+            document.getElementById('question-search').addEventListener('input', renderQuestionList);
+            document.getElementById('question-list').addEventListener('change', (event) => {
+                goToPage(Number(event.target.value));
+            });
+            renderQuestionList();
+            if (questions.length > 0) {
+                goToPage(0);
+            }
+        })
+        .catch(() => {
+            document.getElementById('errors').innerText = 'There was an error loading the question list.';
+        });
+});
+
+function renderQuestionList() {
+    const list = document.getElementById('question-list');
+    const count = document.getElementById('question-count');
+    const search = document.getElementById('question-search').value.trim().toLowerCase();
+    const matches = questions
+        .map((question, index) => ({question, index}))
+        .filter(({question}) => {
+            if (search === '') {
+                return true;
+            }
+            return question.name.toLowerCase().includes(search) ||
+                question.filename.toLowerCase().includes(search);
+        });
+    const visibleMatches = matches.slice(0, maxVisibleQuestions);
+
+    list.innerHTML = '';
+    for (const {question, index} of visibleMatches) {
+        const option = document.createElement('option');
+        option.value = index;
+        option.text = `${question.name} - ${question.filename}`;
+        option.title = question.category;
+        if (index === page) {
+            option.selected = true;
+        }
+        list.appendChild(option);
+    }
+
+    count.innerText = visibleMatches.length === matches.length ?
+        `${matches.length} matching questions` :
+        `${visibleMatches.length} of ${matches.length} matching questions`;
+}
+
+function goToPage(targetPage) {
+    page = targetPage;
+    document.getElementById('question-list').value = String(page);
+    document.getElementById('question-frame').src =
+        `/embed?questionId=${encodeURIComponent(questions[page].questionId)}`;
+}
diff --git a/api/private-demo/question-manifest.json b/api/private-demo/question-manifest.json
new file mode 100644
index 00000000000..555931ae9c5
--- /dev/null
+++ b/api/private-demo/question-manifest.json
@@ -0,0 +1,17848 @@
+{
+    "root": "samplequestions/stacklibrary",
+    "questions": {
+        "q_e3e6491ff2b4ee12": {
+            "id": "q_e3e6491ff2b4ee12",
+            "name": "AlgMap-1.1",
+            "filename": "AlgMap-1-1.xml",
+            "path": "Algebra-Refresher/01-Combinations-of-arithmetic-operations/AlgMap-1-1.xml",
+            "category": "Algebra-Refresher/01-Combinations-of-arithmetic-operations"
+        },
+        "q_ae2a68e432c6de1b": {
+            "id": "q_ae2a68e432c6de1b",
+            "name": "AlgMap-1.2",
+            "filename": "AlgMap-1-2.xml",
+            "path": "Algebra-Refresher/01-Combinations-of-arithmetic-operations/AlgMap-1-2.xml",
+            "category": "Algebra-Refresher/01-Combinations-of-arithmetic-operations"
+        },
+        "q_9dcf0864c35efd81": {
+            "id": "q_9dcf0864c35efd81",
+            "name": "AlgMap-1.3",
+            "filename": "AlgMap-1-3.xml",
+            "path": "Algebra-Refresher/01-Combinations-of-arithmetic-operations/AlgMap-1-3.xml",
+            "category": "Algebra-Refresher/01-Combinations-of-arithmetic-operations"
+        },
+        "q_e3cdde438286c639": {
+            "id": "q_e3cdde438286c639",
+            "name": "AlgMap-1.4",
+            "filename": "AlgMap-1-4.xml",
+            "path": "Algebra-Refresher/01-Combinations-of-arithmetic-operations/AlgMap-1-4.xml",
+            "category": "Algebra-Refresher/01-Combinations-of-arithmetic-operations"
+        },
+        "q_ba5e6f00eb5a0d28": {
+            "id": "q_ba5e6f00eb5a0d28",
+            "name": "AlgMap-1.5",
+            "filename": "AlgMap-1-5.xml",
+            "path": "Algebra-Refresher/01-Combinations-of-arithmetic-operations/AlgMap-1-5.xml",
+            "category": "Algebra-Refresher/01-Combinations-of-arithmetic-operations"
+        },
+        "q_aa88d858459e8ec8": {
+            "id": "q_aa88d858459e8ec8",
+            "name": "AlgMap-1.6",
+            "filename": "AlgMap-1-6.xml",
+            "path": "Algebra-Refresher/01-Combinations-of-arithmetic-operations/AlgMap-1-6.xml",
+            "category": "Algebra-Refresher/01-Combinations-of-arithmetic-operations"
+        },
+        "q_5088286228155553": {
+            "id": "q_5088286228155553",
+            "name": "AlgMap-1.7",
+            "filename": "AlgMap-1-7.xml",
+            "path": "Algebra-Refresher/01-Combinations-of-arithmetic-operations/AlgMap-1-7.xml",
+            "category": "Algebra-Refresher/01-Combinations-of-arithmetic-operations"
+        },
+        "q_b6e34a6c7fb022a3": {
+            "id": "q_b6e34a6c7fb022a3",
+            "name": "AlgMap-2.1",
+            "filename": "AlgMap-2-1.xml",
+            "path": "Algebra-Refresher/02-Factorisation-of-whole-numbers/AlgMap-2-1.xml",
+            "category": "Algebra-Refresher/02-Factorisation-of-whole-numbers"
+        },
+        "q_ec6c57ec5e030e0c": {
+            "id": "q_ec6c57ec5e030e0c",
+            "name": "AlgMap-2.2",
+            "filename": "AlgMap-2-2.xml",
+            "path": "Algebra-Refresher/02-Factorisation-of-whole-numbers/AlgMap-2-2.xml",
+            "category": "Algebra-Refresher/02-Factorisation-of-whole-numbers"
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+        "q_e750c40cde46d615": {
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+            "path": "HELM/Course_quiz_13_6-integration-of-trigonometric-functions/top/Default-for-13-6/13-6-3-2-T-Integrals-represented-by-I_n.xml",
+            "category": "HELM/Course_quiz_13_6-integration-of-trigonometric-functions/top/Default-for-13-6"
+        },
+        "q_454bf3a86281ee6a": {
+            "id": "q_454bf3a86281ee6a",
+            "name": "13.6.3.4 T Wallis's formula",
+            "filename": "13-6-3-4-T-Wallis-s-formula.xml",
+            "path": "HELM/Course_quiz_13_6-integration-of-trigonometric-functions/top/Default-for-13-6/13-6-3-4-T-Wallis-s-formula.xml",
+            "category": "HELM/Course_quiz_13_6-integration-of-trigonometric-functions/top/Default-for-13-6"
+        },
+        "q_008f34ffc98a274b": {
+            "id": "q_008f34ffc98a274b",
+            "name": "13.6.5.1 Identities",
+            "filename": "13-6-5-1-Identities.xml",
+            "path": "HELM/Course_quiz_13_6-integration-of-trigonometric-functions/top/Default-for-13-6/13-6-5-1-Identities.xml",
+            "category": "HELM/Course_quiz_13_6-integration-of-trigonometric-functions/top/Default-for-13-6"
+        },
+        "q_b3a0170224c6ac9c": {
+            "id": "q_b3a0170224c6ac9c",
+            "name": "13.6.5.2 Identities",
+            "filename": "13-6-5-2-Identities.xml",
+            "path": "HELM/Course_quiz_13_6-integration-of-trigonometric-functions/top/Default-for-13-6/13-6-5-2-Identities.xml",
+            "category": "HELM/Course_quiz_13_6-integration-of-trigonometric-functions/top/Default-for-13-6"
+        },
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+            "id": "q_fb36c1c401de14fb",
+            "name": "13.6.5.3 Identities",
+            "filename": "13-6-5-3-Identities.xml",
+            "path": "HELM/Course_quiz_13_6-integration-of-trigonometric-functions/top/Default-for-13-6/13-6-5-3-Identities.xml",
+            "category": "HELM/Course_quiz_13_6-integration-of-trigonometric-functions/top/Default-for-13-6"
+        },
+        "q_9a0c0c6978bb53eb": {
+            "id": "q_9a0c0c6978bb53eb",
+            "name": "14.1.1.2 Rectangles Single PRT",
+            "filename": "14-1-1-2-Rectangles-Single-PRT.xml",
+            "path": "HELM/Course_quiz_14_1-integration-as-the-limit-of-a-sum/top/Default-for-14-1/14-1-1-2-Rectangles-Single-PRT.xml",
+            "category": "HELM/Course_quiz_14_1-integration-as-the-limit-of-a-sum/top/Default-for-14-1"
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+        "q_3285486f58c6529c": {
+            "id": "q_3285486f58c6529c",
+            "name": "14.1.1.4 Area Using Limit of Sum",
+            "filename": "14-1-1-4-Area-Using-Limit-of-Sum.xml",
+            "path": "HELM/Course_quiz_14_1-integration-as-the-limit-of-a-sum/top/Default-for-14-1/14-1-1-4-Area-Using-Limit-of-Sum.xml",
+            "category": "HELM/Course_quiz_14_1-integration-as-the-limit-of-a-sum/top/Default-for-14-1"
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+        "q_c07e46e2a04a6180": {
+            "id": "q_c07e46e2a04a6180",
+            "name": "14.1.1.5 Area Using Limit of Sum 2",
+            "filename": "14-1-1-5-Area-Using-Limit-of-Sum-2.xml",
+            "path": "HELM/Course_quiz_14_1-integration-as-the-limit-of-a-sum/top/Default-for-14-1/14-1-1-5-Area-Using-Limit-of-Sum-2.xml",
+            "category": "HELM/Course_quiz_14_1-integration-as-the-limit-of-a-sum/top/Default-for-14-1"
+        },
+        "q_9ce8c7d0760d8711": {
+            "id": "q_9ce8c7d0760d8711",
+            "name": "14.1.1.6 Integrals",
+            "filename": "14-1-1-6-Integrals.xml",
+            "path": "HELM/Course_quiz_14_1-integration-as-the-limit-of-a-sum/top/Default-for-14-1/14-1-1-6-Integrals.xml",
+            "category": "HELM/Course_quiz_14_1-integration-as-the-limit-of-a-sum/top/Default-for-14-1"
+        },
+        "q_0e8eb9e919735659": {
+            "id": "q_0e8eb9e919735659",
+            "name": "Interactive JSX - Rectangles Single PRT",
+            "filename": "Interactive-JSX---Rectangles-Single-PRT.xml",
+            "path": "HELM/Course_quiz_14_1-integration-as-the-limit-of-a-sum/top/Default-for-14-1/Interactive-JSX---Rectangles-Single-PRT.xml",
+            "category": "HELM/Course_quiz_14_1-integration-as-the-limit-of-a-sum/top/Default-for-14-1"
+        },
+        "q_3aecfb0f24141ab8": {
+            "id": "q_3aecfb0f24141ab8",
+            "name": "14.2.1.2 Mean value of a function",
+            "filename": "14-2-1-2-Mean-value-of-a-function.xml",
+            "path": "HELM/Course_quiz_14_2-the-mean-value-and-the-root-mean-square-value/top/Default-for-14-2/14-2-1-2-Mean-value-of-a-function.xml",
+            "category": "HELM/Course_quiz_14_2-the-mean-value-and-the-root-mean-square-value/top/Default-for-14-2"
+        },
+        "q_4c8eb8b304f819a5": {
+            "id": "q_4c8eb8b304f819a5",
+            "name": "14.2.1.4 Finding means of functions",
+            "filename": "14-2-1-4-Finding-means-of-functions.xml",
+            "path": "HELM/Course_quiz_14_2-the-mean-value-and-the-root-mean-square-value/top/Default-for-14-2/14-2-1-4-Finding-means-of-functions.xml",
+            "category": "HELM/Course_quiz_14_2-the-mean-value-and-the-root-mean-square-value/top/Default-for-14-2"
+        },
+        "q_ff889b8918917ab4": {
+            "id": "q_ff889b8918917ab4",
+            "name": "14.2.1.5 Finding more means of functions",
+            "filename": "14-2-1-5-Finding-more-means-of-functions.xml",
+            "path": "HELM/Course_quiz_14_2-the-mean-value-and-the-root-mean-square-value/top/Default-for-14-2/14-2-1-5-Finding-more-means-of-functions.xml",
+            "category": "HELM/Course_quiz_14_2-the-mean-value-and-the-root-mean-square-value/top/Default-for-14-2"
+        },
+        "q_4253243e2ca2730d": {
+            "id": "q_4253243e2ca2730d",
+            "name": "14.2.1.6 Finding means of trig functions",
+            "filename": "14-2-1-6-Finding-means-of-trig-functions.xml",
+            "path": "HELM/Course_quiz_14_2-the-mean-value-and-the-root-mean-square-value/top/Default-for-14-2/14-2-1-6-Finding-means-of-trig-functions.xml",
+            "category": "HELM/Course_quiz_14_2-the-mean-value-and-the-root-mean-square-value/top/Default-for-14-2"
+        },
+        "q_04a07c51481c26ba": {
+            "id": "q_04a07c51481c26ba",
+            "name": "14.2.1.7 Finding more means of more functions",
+            "filename": "14-2-1-7-Finding-more-means-of-more-functions.xml",
+            "path": "HELM/Course_quiz_14_2-the-mean-value-and-the-root-mean-square-value/top/Default-for-14-2/14-2-1-7-Finding-more-means-of-more-functions.xml",
+            "category": "HELM/Course_quiz_14_2-the-mean-value-and-the-root-mean-square-value/top/Default-for-14-2"
+        },
+        "q_a6c7ec8e2251aac2": {
+            "id": "q_a6c7ec8e2251aac2",
+            "name": "14.2.2.2 Finding r.m.s of functions",
+            "filename": "14-2-2-2-Finding-r-m-s-of-functions.xml",
+            "path": "HELM/Course_quiz_14_2-the-mean-value-and-the-root-mean-square-value/top/Default-for-14-2/14-2-2-2-Finding-r-m-s-of-functions.xml",
+            "category": "HELM/Course_quiz_14_2-the-mean-value-and-the-root-mean-square-value/top/Default-for-14-2"
+        },
+        "q_99bf8695258aa6fb": {
+            "id": "q_99bf8695258aa6fb",
+            "name": "14.2.2.3 Finding more r.m.s of functions",
+            "filename": "14-2-2-3-Finding-more-r-m-s-of-functions.xml",
+            "path": "HELM/Course_quiz_14_2-the-mean-value-and-the-root-mean-square-value/top/Default-for-14-2/14-2-2-3-Finding-more-r-m-s-of-functions.xml",
+            "category": "HELM/Course_quiz_14_2-the-mean-value-and-the-root-mean-square-value/top/Default-for-14-2"
+        },
+        "q_c403d87626bdcc35": {
+            "id": "q_c403d87626bdcc35",
+            "name": "14.2.2.4 Finding r.m.s. of trig functions (long copy)",
+            "filename": "14-2-2-4-Finding-r-m-s-of-trig-functions-(long-copy).xml",
+            "path": "HELM/Course_quiz_14_2-the-mean-value-and-the-root-mean-square-value/top/Default-for-14-2/14-2-2-4-Finding-r-m-s-of-trig-functions-(long-copy).xml",
+            "category": "HELM/Course_quiz_14_2-the-mean-value-and-the-root-mean-square-value/top/Default-for-14-2"
+        },
+        "q_05f42a2caac95135": {
+            "id": "q_05f42a2caac95135",
+            "name": "14.2.2.4 Finding r.m.s. of trig functions",
+            "filename": "14-2-2-4-Finding-r-m-s-of-trig-functions.xml",
+            "path": "HELM/Course_quiz_14_2-the-mean-value-and-the-root-mean-square-value/top/Default-for-14-2/14-2-2-4-Finding-r-m-s-of-trig-functions.xml",
+            "category": "HELM/Course_quiz_14_2-the-mean-value-and-the-root-mean-square-value/top/Default-for-14-2"
+        },
+        "q_ea740a57eeb977f6": {
+            "id": "q_ea740a57eeb977f6",
+            "name": "14.2.2.5 Finding more r.m.s. of more functions",
+            "filename": "14-2-2-5-Finding-more-r-m-s-of-more-functions.xml",
+            "path": "HELM/Course_quiz_14_2-the-mean-value-and-the-root-mean-square-value/top/Default-for-14-2/14-2-2-5-Finding-more-r-m-s-of-more-functions.xml",
+            "category": "HELM/Course_quiz_14_2-the-mean-value-and-the-root-mean-square-value/top/Default-for-14-2"
+        },
+        "q_63efaf5ceb6eea00": {
+            "id": "q_63efaf5ceb6eea00",
+            "name": "14.3.1.2 Find volume of cone",
+            "filename": "14-3-1-2-Find-volume-of-cone.xml",
+            "path": "HELM/Course_quiz_14_3-volumes-of-revolution/top/Default-for-14-3/14-3-1-2-Find-volume-of-cone.xml",
+            "category": "HELM/Course_quiz_14_3-volumes-of-revolution/top/Default-for-14-3"
+        },
+        "q_5b2149f3f87d9781": {
+            "id": "q_5b2149f3f87d9781",
+            "name": "14.3.1.3 Find volume of rotated parabola",
+            "filename": "14-3-1-3-Find-volume-of-rotated-parabola.xml",
+            "path": "HELM/Course_quiz_14_3-volumes-of-revolution/top/Default-for-14-3/14-3-1-3-Find-volume-of-rotated-parabola.xml",
+            "category": "HELM/Course_quiz_14_3-volumes-of-revolution/top/Default-for-14-3"
+        },
+        "q_2722fc3a44173e1d": {
+            "id": "q_2722fc3a44173e1d",
+            "name": "14.3.1.4 Find volume of solid of revolution",
+            "filename": "14-3-1-4-Find-volume-of-solid-of-revolution.xml",
+            "path": "HELM/Course_quiz_14_3-volumes-of-revolution/top/Default-for-14-3/14-3-1-4-Find-volume-of-solid-of-revolution.xml",
+            "category": "HELM/Course_quiz_14_3-volumes-of-revolution/top/Default-for-14-3"
+        },
+        "q_8e3cb5f1f4c53541": {
+            "id": "q_8e3cb5f1f4c53541",
+            "name": "14.3.1.6 Finding volume of a solid of revolution",
+            "filename": "14-3-1-6-Finding-volume-of-a-solid-of-revolution.xml",
+            "path": "HELM/Course_quiz_14_3-volumes-of-revolution/top/Default-for-14-3/14-3-1-6-Finding-volume-of-a-solid-of-revolution.xml",
+            "category": "HELM/Course_quiz_14_3-volumes-of-revolution/top/Default-for-14-3"
+        },
+        "q_20ee8a1f15a59c49": {
+            "id": "q_20ee8a1f15a59c49",
+            "name": "14.3.1.7 Finding volume of a solid of revolution",
+            "filename": "14-3-1-7-Finding-volume-of-a-solid-of-revolution.xml",
+            "path": "HELM/Course_quiz_14_3-volumes-of-revolution/top/Default-for-14-3/14-3-1-7-Finding-volume-of-a-solid-of-revolution.xml",
+            "category": "HELM/Course_quiz_14_3-volumes-of-revolution/top/Default-for-14-3"
+        },
+        "q_17c340b4b8c76cdf": {
+            "id": "q_17c340b4b8c76cdf",
+            "name": "14.3.2.2 Find volume of parabola around y-axis",
+            "filename": "14-3-2-2-Find-volume-of-parabola-around-y-axis.xml",
+            "path": "HELM/Course_quiz_14_3-volumes-of-revolution/top/Default-for-14-3/14-3-2-2-Find-volume-of-parabola-around-y-axis.xml",
+            "category": "HELM/Course_quiz_14_3-volumes-of-revolution/top/Default-for-14-3"
+        },
+        "q_c3a7fb9ddf90d567": {
+            "id": "q_c3a7fb9ddf90d567",
+            "name": "14.3.2.3 Find volume of parabola around y-axis",
+            "filename": "14-3-2-3-Find-volume-of-parabola-around-y-axis.xml",
+            "path": "HELM/Course_quiz_14_3-volumes-of-revolution/top/Default-for-14-3/14-3-2-3-Find-volume-of-parabola-around-y-axis.xml",
+            "category": "HELM/Course_quiz_14_3-volumes-of-revolution/top/Default-for-14-3"
+        },
+        "q_e094f333bb2c1e42": {
+            "id": "q_e094f333bb2c1e42",
+            "name": "14.3.2.4 Find volume of line around y-axis",
+            "filename": "14-3-2-4-Find-volume-of-line-around-y-axis.xml",
+            "path": "HELM/Course_quiz_14_3-volumes-of-revolution/top/Default-for-14-3/14-3-2-4-Find-volume-of-line-around-y-axis.xml",
+            "category": "HELM/Course_quiz_14_3-volumes-of-revolution/top/Default-for-14-3"
+        },
+        "q_e73cec471cf846ce": {
+            "id": "q_e73cec471cf846ce",
+            "name": "14.4.1.1 Exercise 1",
+            "filename": "14-4-1-1-Exercise-1.xml",
+            "path": "HELM/Course_quiz_14_4-lengths-of-curves-and-surfaces-of-revolution/top/Default-for-14-4/14-4-1-1-Exercise-1.xml",
+            "category": "HELM/Course_quiz_14_4-lengths-of-curves-and-surfaces-of-revolution/top/Default-for-14-4"
+        },
+        "q_bd4743a420237f4f": {
+            "id": "q_bd4743a420237f4f",
+            "name": "14.4.1.2 Exercise 2",
+            "filename": "14-4-1-2-Exercise-2.xml",
+            "path": "HELM/Course_quiz_14_4-lengths-of-curves-and-surfaces-of-revolution/top/Default-for-14-4/14-4-1-2-Exercise-2.xml",
+            "category": "HELM/Course_quiz_14_4-lengths-of-curves-and-surfaces-of-revolution/top/Default-for-14-4"
+        },
+        "q_b146e051af5fe6ec": {
+            "id": "q_b146e051af5fe6ec",
+            "name": "14.4.1.3 Exercise 3",
+            "filename": "14-4-1-3-Exercise-3.xml",
+            "path": "HELM/Course_quiz_14_4-lengths-of-curves-and-surfaces-of-revolution/top/Default-for-14-4/14-4-1-3-Exercise-3.xml",
+            "category": "HELM/Course_quiz_14_4-lengths-of-curves-and-surfaces-of-revolution/top/Default-for-14-4"
+        },
+        "q_d07df705d8ed0e99": {
+            "id": "q_d07df705d8ed0e99",
+            "name": "14.4.1a Length of curve 1",
+            "filename": "14-4-1a-Length-of-curve-1.xml",
+            "path": "HELM/Course_quiz_14_4-lengths-of-curves-and-surfaces-of-revolution/top/Default-for-14-4/14-4-1a-Length-of-curve-1.xml",
+            "category": "HELM/Course_quiz_14_4-lengths-of-curves-and-surfaces-of-revolution/top/Default-for-14-4"
+        },
+        "q_573c8a5bdc3df66b": {
+            "id": "q_573c8a5bdc3df66b",
+            "name": "14.4.1b Length of curve 2",
+            "filename": "14-4-1b-Length-of-curve-2.xml",
+            "path": "HELM/Course_quiz_14_4-lengths-of-curves-and-surfaces-of-revolution/top/Default-for-14-4/14-4-1b-Length-of-curve-2.xml",
+            "category": "HELM/Course_quiz_14_4-lengths-of-curves-and-surfaces-of-revolution/top/Default-for-14-4"
+        },
+        "q_4ca2863ca188f59e": {
+            "id": "q_4ca2863ca188f59e",
+            "name": "14.4.2.1 Area of surface",
+            "filename": "14-4-2-1-Area-of-surface.xml",
+            "path": "HELM/Course_quiz_14_4-lengths-of-curves-and-surfaces-of-revolution/top/Default-for-14-4/14-4-2-1-Area-of-surface.xml",
+            "category": "HELM/Course_quiz_14_4-lengths-of-curves-and-surfaces-of-revolution/top/Default-for-14-4"
+        },
+        "q_3ccbcf247f057a0b": {
+            "id": "q_3ccbcf247f057a0b",
+            "name": "14.4.2.2 Exercise 1",
+            "filename": "14-4-2-2-Exercise-1.xml",
+            "path": "HELM/Course_quiz_14_4-lengths-of-curves-and-surfaces-of-revolution/top/Default-for-14-4/14-4-2-2-Exercise-1.xml",
+            "category": "HELM/Course_quiz_14_4-lengths-of-curves-and-surfaces-of-revolution/top/Default-for-14-4"
+        },
+        "q_0bc7621961eff6ec": {
+            "id": "q_0bc7621961eff6ec",
+            "name": "14.4.2.3 Exercise 2",
+            "filename": "14-4-2-3-Exercise-2.xml",
+            "path": "HELM/Course_quiz_14_4-lengths-of-curves-and-surfaces-of-revolution/top/Default-for-14-4/14-4-2-3-Exercise-2.xml",
+            "category": "HELM/Course_quiz_14_4-lengths-of-curves-and-surfaces-of-revolution/top/Default-for-14-4"
+        },
+        "q_e9e5b7fd5431c085": {
+            "id": "q_e9e5b7fd5431c085",
+            "name": "15.2.1.2 Moment of single point mass",
+            "filename": "15-2-1-2-Moment-of-single-point-mass.xml",
+            "path": "HELM/Course_quiz_15_2-calculating-centres-of-mass/top/Default-for-15-2/15-2-1-2-Moment-of-single-point-mass.xml",
+            "category": "HELM/Course_quiz_15_2-calculating-centres-of-mass/top/Default-for-15-2"
+        },
+        "q_e092c1e444f05e12": {
+            "id": "q_e092c1e444f05e12",
+            "name": "15.2.1.4 Calculating centre of mass rod with 2 masses",
+            "filename": "15-2-1-4-Calculating-centre-of-mass-rod-with-2-masses.xml",
+            "path": "HELM/Course_quiz_15_2-calculating-centres-of-mass/top/Default-for-15-2/15-2-1-4-Calculating-centre-of-mass-rod-with-2-masses.xml",
+            "category": "HELM/Course_quiz_15_2-calculating-centres-of-mass/top/Default-for-15-2"
+        },
+        "q_56ea6cdddc389589": {
+            "id": "q_56ea6cdddc389589",
+            "name": "15.2.1.6 COM of 4 masses on line",
+            "filename": "15-2-1-6-COM-of-4-masses-on-line.xml",
+            "path": "HELM/Course_quiz_15_2-calculating-centres-of-mass/top/Default-for-15-2/15-2-1-6-COM-of-4-masses-on-line.xml",
+            "category": "HELM/Course_quiz_15_2-calculating-centres-of-mass/top/Default-for-15-2"
+        },
+        "q_cc233c11b8a86b03": {
+            "id": "q_cc233c11b8a86b03",
+            "name": "15.2.1.8 COM of point masses in plane",
+            "filename": "15-2-1-8-COM-of-point-masses-in-plane.xml",
+            "path": "HELM/Course_quiz_15_2-calculating-centres-of-mass/top/Default-for-15-2/15-2-1-8-COM-of-point-masses-in-plane.xml",
+            "category": "HELM/Course_quiz_15_2-calculating-centres-of-mass/top/Default-for-15-2"
+        },
+        "q_4feb596804806974": {
+            "id": "q_4feb596804806974",
+            "name": "15.2.1.9 COM of 5 masses on line",
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+            "path": "HELM/Course_quiz_5_3-oscillating-functions-and-modelling/top/Default-for-5-3/5-3-2-5-Amplitude,-period-and-frequency.xml",
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+            "filename": "5-3-2-6-Water-level.xml",
+            "path": "HELM/Course_quiz_5_3-oscillating-functions-and-modelling/top/Default-for-5-3/5-3-2-6-Water-level.xml",
+            "category": "HELM/Course_quiz_5_3-oscillating-functions-and-modelling/top/Default-for-5-3"
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+            "filename": "6-1-1-2-Simplify-the-expression-1.xml",
+            "path": "HELM/Course_quiz_6_1-the-exponential-function/top/Default-for-6-1/6-1-1-2-Simplify-the-expression-1.xml",
+            "category": "HELM/Course_quiz_6_1-the-exponential-function/top/Default-for-6-1"
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+            "filename": "6-1-1-3-Simplify-the-expression-2.xml",
+            "path": "HELM/Course_quiz_6_1-the-exponential-function/top/Default-for-6-1/6-1-1-3-Simplify-the-expression-2.xml",
+            "category": "HELM/Course_quiz_6_1-the-exponential-function/top/Default-for-6-1"
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+        "q_252a3be590b2ccac": {
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+            "path": "HELM/Course_quiz_6_1-the-exponential-function/top/Default-for-6-1/6-1-1-5-Find-the-value-of-the-expression-(NOT-IN-QUIZ).xml",
+            "category": "HELM/Course_quiz_6_1-the-exponential-function/top/Default-for-6-1"
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+            "path": "HELM/Course_quiz_6_1-the-exponential-function/top/Default-for-6-1/6-1-2-2-Find-values-with-a-calculator.xml",
+            "category": "HELM/Course_quiz_6_1-the-exponential-function/top/Default-for-6-1"
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+            "filename": "6-1-2-3-Simplify-and-determine-the-value-of-the-expression.xml",
+            "path": "HELM/Course_quiz_6_1-the-exponential-function/top/Default-for-6-1/6-1-2-3-Simplify-and-determine-the-value-of-the-expression.xml",
+            "category": "HELM/Course_quiz_6_1-the-exponential-function/top/Default-for-6-1"
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+        "q_1195f4143aab1732": {
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+            "path": "HELM/Course_quiz_6_1-the-exponential-function/top/Default-for-6-1/6-1-3-2-Exponential-growth-of-a-fuction.xml",
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+            "category": "HELM/Course_quiz_6_1-the-exponential-function/top/Default-for-6-1"
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+            "category": "HELM/Course_quiz_6_1-the-exponential-function/top/Default-for-6-1"
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+            "path": "HELM/Course_quiz_6_2-the-hyperbolic-functions/top/Default-for-6-2/6-2-1-2-Separate-odd-and-even-parts.xml",
+            "category": "HELM/Course_quiz_6_2-the-hyperbolic-functions/top/Default-for-6-2"
+        },
+        "q_312eec95f5448d88": {
+            "id": "q_312eec95f5448d88",
+            "name": "6.2.2.2 cosh^2-sinh^2",
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+            "path": "HELM/Course_quiz_6_2-the-hyperbolic-functions/top/Default-for-6-2/6-2-2-2-cosh^2-sinh^2.xml",
+            "category": "HELM/Course_quiz_6_2-the-hyperbolic-functions/top/Default-for-6-2"
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+        "q_520e5d8b8f235705": {
+            "id": "q_520e5d8b8f235705",
+            "name": "6.2.2.3 cosh(x+y)",
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+            "path": "HELM/Course_quiz_6_2-the-hyperbolic-functions/top/Default-for-6-2/6-2-2-3-cosh(x+y).xml",
+            "category": "HELM/Course_quiz_6_2-the-hyperbolic-functions/top/Default-for-6-2"
+        },
+        "q_c90a21da303e9efb": {
+            "id": "q_c90a21da303e9efb",
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+            "filename": "6-2-2-4-Compute-cosh(x+y)-knowing-sinhx,-sinhy.xml",
+            "path": "HELM/Course_quiz_6_2-the-hyperbolic-functions/top/Default-for-6-2/6-2-2-4-Compute-cosh(x+y)-knowing-sinhx,-sinhy.xml",
+            "category": "HELM/Course_quiz_6_2-the-hyperbolic-functions/top/Default-for-6-2"
+        },
+        "q_d52f249ececa4120": {
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+            "name": "6.2.2.5 (not in quiz) sinh(x+y)",
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+            "path": "HELM/Course_quiz_6_2-the-hyperbolic-functions/top/Default-for-6-2/6-2-2-5-(not-in-quiz)-sinh(x+y).xml",
+            "category": "HELM/Course_quiz_6_2-the-hyperbolic-functions/top/Default-for-6-2"
+        },
+        "q_de86f6483e36c093": {
+            "id": "q_de86f6483e36c093",
+            "name": "6.2.2.6 (not in quiz) Compute sinh(x+y) knowing sinhx, sinhy",
+            "filename": "6-2-2-6-(not-in-quiz)-Compute-sinh(x+y)-knowing-sinhx,-sinhy.xml",
+            "path": "HELM/Course_quiz_6_2-the-hyperbolic-functions/top/Default-for-6-2/6-2-2-6-(not-in-quiz)-Compute-sinh(x+y)-knowing-sinhx,-sinhy.xml",
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+        },
+        "q_9d43a33d32bb0891": {
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+            "name": "6.2.3.3 Compute sech given tanh",
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+            "path": "HELM/Course_quiz_6_2-the-hyperbolic-functions/top/Default-for-6-2/6-2-3-3-Compute-sech-given-tanh.xml",
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+        },
+        "q_f2bc51d20b103684": {
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+            "name": "6.2.4.1 (not in quiz) Express sinh, cosh in terms of exp (exercise 1(a))",
+            "filename": "6-2-4-1-(not-in-quiz)-Express-sinh,-cosh-in-terms-of-exp-(exercise-1(a)).xml",
+            "path": "HELM/Course_quiz_6_2-the-hyperbolic-functions/top/Default-for-6-2/6-2-4-1-(not-in-quiz)-Express-sinh,-cosh-in-terms-of-exp-(exercise-1(a)).xml",
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+        },
+        "q_8588feec7d9a5182": {
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+            "name": "6.2.4.2 Express sinh, cosh in terms of exp (exercise 1(b))",
+            "filename": "6-2-4-2-Express-sinh,-cosh-in-terms-of-exp-(exercise-1(b)).xml",
+            "path": "HELM/Course_quiz_6_2-the-hyperbolic-functions/top/Default-for-6-2/6-2-4-2-Express-sinh,-cosh-in-terms-of-exp-(exercise-1(b)).xml",
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+        "q_e3146bdc1c9b9a22": {
+            "id": "q_e3146bdc1c9b9a22",
+            "name": "6.2.4.3 Express exp in terms of sinh, cosh (exercise 2(a))",
+            "filename": "6-2-4-3-Express-exp-in-terms-of-sinh,-cosh-(exercise-2(a)).xml",
+            "path": "HELM/Course_quiz_6_2-the-hyperbolic-functions/top/Default-for-6-2/6-2-4-3-Express-exp-in-terms-of-sinh,-cosh-(exercise-2(a)).xml",
+            "category": "HELM/Course_quiz_6_2-the-hyperbolic-functions/top/Default-for-6-2"
+        },
+        "q_0da2bf7ceaabdf77": {
+            "id": "q_0da2bf7ceaabdf77",
+            "name": "6.2.4.4 Express exp in terms of coth (exercise 2(b))",
+            "filename": "6-2-4-4-Express-exp-in-terms-of-coth-(exercise-2(b)).xml",
+            "path": "HELM/Course_quiz_6_2-the-hyperbolic-functions/top/Default-for-6-2/6-2-4-4-Express-exp-in-terms-of-coth-(exercise-2(b)).xml",
+            "category": "HELM/Course_quiz_6_2-the-hyperbolic-functions/top/Default-for-6-2"
+        },
+        "q_55cc672d38f0c426": {
+            "id": "q_55cc672d38f0c426",
+            "name": "6.2.4.5 (not in quiz) Express exp in terms of sinh, cosh (exercise 2(c))",
+            "filename": "6-2-4-5-(not-in-quiz)-Express-exp-in-terms-of-sinh,-cosh-(exercise-2(c)).xml",
+            "path": "HELM/Course_quiz_6_2-the-hyperbolic-functions/top/Default-for-6-2/6-2-4-5-(not-in-quiz)-Express-exp-in-terms-of-sinh,-cosh-(exercise-2(c)).xml",
+            "category": "HELM/Course_quiz_6_2-the-hyperbolic-functions/top/Default-for-6-2"
+        },
+        "q_0425702483380aa3": {
+            "id": "q_0425702483380aa3",
+            "name": "6.2.4.6 Calculate tanh, cosech, sech (exercise 3) (NOT IN QUIZ)",
+            "filename": "6-2-4-6-Calculate-tanh,-cosech,-sech-(exercise-3)-(NOT-IN-QUIZ).xml",
+            "path": "HELM/Course_quiz_6_2-the-hyperbolic-functions/top/Default-for-6-2/6-2-4-6-Calculate-tanh,-cosech,-sech-(exercise-3)-(NOT-IN-QUIZ).xml",
+            "category": "HELM/Course_quiz_6_2-the-hyperbolic-functions/top/Default-for-6-2"
+        },
+        "q_db3809fb3fefd4fd": {
+            "id": "q_db3809fb3fefd4fd",
+            "name": "6.3.1.2 Find log_a(a^n)",
+            "filename": "6-3-1-2-Find-log_a(a^n).xml",
+            "path": "HELM/Course_quiz_6_3-logarithms/top/Default-for-6-3/6-3-1-2-Find-log_a(a^n).xml",
+            "category": "HELM/Course_quiz_6_3-logarithms/top/Default-for-6-3"
+        },
+        "q_b509142171243e5a": {
+            "id": "q_b509142171243e5a",
+            "name": "6.3.1.3 Log of a product",
+            "filename": "6-3-1-3-Log-of-a-product.xml",
+            "path": "HELM/Course_quiz_6_3-logarithms/top/Default-for-6-3/6-3-1-3-Log-of-a-product.xml",
+            "category": "HELM/Course_quiz_6_3-logarithms/top/Default-for-6-3"
+        },
+        "q_5cef0dc1de5dc352": {
+            "id": "q_5cef0dc1de5dc352",
+            "name": "6.3.2.2 Simplify sums of logs",
+            "filename": "6-3-2-2-Simplify-sums-of-logs.xml",
+            "path": "HELM/Course_quiz_6_3-logarithms/top/Default-for-6-3/6-3-2-2-Simplify-sums-of-logs.xml",
+            "category": "HELM/Course_quiz_6_3-logarithms/top/Default-for-6-3"
+        },
+        "q_e78b0900379f67cb": {
+            "id": "q_e78b0900379f67cb",
+            "name": "6.3.3.2 Compute logs base 10",
+            "filename": "6-3-3-2-Compute-logs-base-10.xml",
+            "path": "HELM/Course_quiz_6_3-logarithms/top/Default-for-6-3/6-3-3-2-Compute-logs-base-10.xml",
+            "category": "HELM/Course_quiz_6_3-logarithms/top/Default-for-6-3"
+        },
+        "q_8fd67cf9d2c6f1a0": {
+            "id": "q_8fd67cf9d2c6f1a0",
+            "name": "6.3.3.3 Compute logs base e",
+            "filename": "6-3-3-3-Compute-logs-base-e.xml",
+            "path": "HELM/Course_quiz_6_3-logarithms/top/Default-for-6-3/6-3-3-3-Compute-logs-base-e.xml",
+            "category": "HELM/Course_quiz_6_3-logarithms/top/Default-for-6-3"
+        },
+        "q_3cdaf8e2c42271db": {
+            "id": "q_3cdaf8e2c42271db",
+            "name": "6.3.4.2 Computing logs arbitrary base",
+            "filename": "6-3-4-2-Computing-logs-arbitrary-base.xml",
+            "path": "HELM/Course_quiz_6_3-logarithms/top/Default-for-6-3/6-3-4-2-Computing-logs-arbitrary-base.xml",
+            "category": "HELM/Course_quiz_6_3-logarithms/top/Default-for-6-3"
+        },
+        "q_e85bb78543a14e72": {
+            "id": "q_e85bb78543a14e72",
+            "name": "6.3.5.1 Compute logs exercise 1(a)",
+            "filename": "6-3-5-1-Compute-logs-exercise-1(a).xml",
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+            "path": "HELM/Course_quiz_6_4-the-logarithmic-function/top/Default-for-6-4/6-4-2-5-Solve-ae^{2x}-\u2212-be^x-+-c-=-0.xml",
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+            "path": "HELM/Course_quiz_7_1-introduction-to-matrices/top/Default-for-7-1/7-1-2-2-Classifying-matrices.xml",
+            "category": "HELM/Course_quiz_7_1-introduction-to-matrices/top/Default-for-7-1"
+        },
+        "q_c3956acd2d169df6": {
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+            "name": "7.1.2.5 Symmetric Matrices",
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+            "path": "HELM/Course_quiz_7_1-introduction-to-matrices/top/Default-for-7-1/7-1-2-5-Symmetric-Matrices.xml",
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+        "q_711b0e45e4c4d012": {
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+        "q_302cb030daca2685": {
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+        "q_fc57ae201d476298": {
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+            "filename": "7-2-2-2-Task-Find-the-product-AB.xml",
+            "path": "HELM/Course_quiz_7_2-matrix-multiplication/top/Default-for-7-2/7-2-2-2-Task-Find-the-product-AB.xml",
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+        "q_fd208003efcc5662": {
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+            "filename": "7-2-3-3-Task2-Multiplying-by-zero.xml",
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+        "q_5331b167cef6c916": {
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+            "category": "HELM/Course_quiz_7_2-matrix-multiplication/top/Default-for-7-2"
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+        "q_cf584c33b09b3dfc": {
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+            "name": "7.2.5.3 Task: Obtain the product AB",
+            "filename": "7-2-5-3-Task-Obtain-the-product-AB.xml",
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+            "category": "HELM/Course_quiz_7_2-matrix-multiplication/top/Default-for-7-2"
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+        "q_73cf0ef60c49378c": {
+            "id": "q_73cf0ef60c49378c",
+            "name": "7.2.6.2 Task: Which of the matrix products are defined",
+            "filename": "7-2-6-2-Task-Which-of-the-matrix-products-are-defined.xml",
+            "path": "HELM/Course_quiz_7_2-matrix-multiplication/top/Default-for-7-2/7-2-6-2-Task-Which-of-the-matrix-products-are-defined.xml",
+            "category": "HELM/Course_quiz_7_2-matrix-multiplication/top/Default-for-7-2"
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+        "q_2eaa1d5c7ec230a2": {
+            "id": "q_2eaa1d5c7ec230a2",
+            "name": "7.2.7.1 Exercise 1 (long) NOT IN QUIZ",
+            "filename": "7-2-7-1-Exercise-1-(long)-NOT-IN-QUIZ.xml",
+            "path": "HELM/Course_quiz_7_2-matrix-multiplication/top/Default-for-7-2/7-2-7-1-Exercise-1-(long)-NOT-IN-QUIZ.xml",
+            "category": "HELM/Course_quiz_7_2-matrix-multiplication/top/Default-for-7-2"
+        },
+        "q_a105de7ec9c26fbf": {
+            "id": "q_a105de7ec9c26fbf",
+            "name": "7.2.7.1 Mult 2x2 (NOT IN QUIZ)",
+            "filename": "7-2-7-1-Mult-2x2-(NOT-IN-QUIZ).xml",
+            "path": "HELM/Course_quiz_7_2-matrix-multiplication/top/Default-for-7-2/7-2-7-1-Mult-2x2-(NOT-IN-QUIZ).xml",
+            "category": "HELM/Course_quiz_7_2-matrix-multiplication/top/Default-for-7-2"
+        },
+        "q_9ae3f5c44ab0c9bb": {
+            "id": "q_9ae3f5c44ab0c9bb",
+            "name": "7.2.7.2 Exercise 2",
+            "filename": "7-2-7-2-Exercise-2.xml",
+            "path": "HELM/Course_quiz_7_2-matrix-multiplication/top/Default-for-7-2/7-2-7-2-Exercise-2.xml",
+            "category": "HELM/Course_quiz_7_2-matrix-multiplication/top/Default-for-7-2"
+        },
+        "q_adfc2e36d5a10ac4": {
+            "id": "q_adfc2e36d5a10ac4",
+            "name": "7.2.7.3 Exercise 3",
+            "filename": "7-2-7-3-Exercise-3.xml",
+            "path": "HELM/Course_quiz_7_2-matrix-multiplication/top/Default-for-7-2/7-2-7-3-Exercise-3.xml",
+            "category": "HELM/Course_quiz_7_2-matrix-multiplication/top/Default-for-7-2"
+        },
+        "q_98e213781b7ae555": {
+            "id": "q_98e213781b7ae555",
+            "name": "7.2.7.4 Exercise 4",
+            "filename": "7-2-7-4-Exercise-4.xml",
+            "path": "HELM/Course_quiz_7_2-matrix-multiplication/top/Default-for-7-2/7-2-7-4-Exercise-4.xml",
+            "category": "HELM/Course_quiz_7_2-matrix-multiplication/top/Default-for-7-2"
+        },
+        "q_c54a6f1e69262a34": {
+            "id": "q_c54a6f1e69262a34",
+            "name": "7.2.7.5 Exercise 5",
+            "filename": "7-2-7-5-Exercise-5.xml",
+            "path": "HELM/Course_quiz_7_2-matrix-multiplication/top/Default-for-7-2/7-2-7-5-Exercise-5.xml",
+            "category": "HELM/Course_quiz_7_2-matrix-multiplication/top/Default-for-7-2"
+        },
+        "q_cc07322f7e13a1c3": {
+            "id": "q_cc07322f7e13a1c3",
+            "name": "7.2.7.6 Exercise 6",
+            "filename": "7-2-7-6-Exercise-6.xml",
+            "path": "HELM/Course_quiz_7_2-matrix-multiplication/top/Default-for-7-2/7-2-7-6-Exercise-6.xml",
+            "category": "HELM/Course_quiz_7_2-matrix-multiplication/top/Default-for-7-2"
+        },
+        "q_75d9a192bac4f37b": {
+            "id": "q_75d9a192bac4f37b",
+            "name": "7.3.1.2 Task: compute these 2x2 determinants",
+            "filename": "7-3-1-2-Task-compute-these-2x2-determinants-b.xml",
+            "path": "HELM/Course_quiz_7_3-determinants/top/Default-for-7-3/7-3-1-2-Task-compute-these-2x2-determinants-b.xml",
+            "category": "HELM/Course_quiz_7_3-determinants/top/Default-for-7-3"
+        },
+        "q_8e8f3488855f3f33": {
+            "id": "q_8e8f3488855f3f33",
+            "name": "7.3.1.2 Task: compute these 2x2 determinants",
+            "filename": "7-3-1-2-Task-compute-these-2x2-determinants.xml",
+            "path": "HELM/Course_quiz_7_3-determinants/top/Default-for-7-3/7-3-1-2-Task-compute-these-2x2-determinants.xml",
+            "category": "HELM/Course_quiz_7_3-determinants/top/Default-for-7-3"
+        },
+        "q_687d191f8584b797": {
+            "id": "q_687d191f8584b797",
+            "name": "7.3.2.2 Compute a 2x2 minor",
+            "filename": "7-3-2-2-Compute-a-2x2-minor.xml",
+            "path": "HELM/Course_quiz_7_3-determinants/top/Default-for-7-3/7-3-2-2-Compute-a-2x2-minor.xml",
+            "category": "HELM/Course_quiz_7_3-determinants/top/Default-for-7-3"
+        },
+        "q_9ec17564979c8f7e": {
+            "id": "q_9ec17564979c8f7e",
+            "name": "7.3.2.4 Compute a cofactor",
+            "filename": "7-3-2-4-Compute-a-cofactor.xml",
+            "path": "HELM/Course_quiz_7_3-determinants/top/Default-for-7-3/7-3-2-4-Compute-a-cofactor.xml",
+            "category": "HELM/Course_quiz_7_3-determinants/top/Default-for-7-3"
+        },
+        "q_a0fb8dd10cb0a748": {
+            "id": "q_a0fb8dd10cb0a748",
+            "name": "7.3.2.6 Compute a 3x3 determinant",
+            "filename": "7-3-2-6-Compute-a-3x3-determinant.xml",
+            "path": "HELM/Course_quiz_7_3-determinants/top/Default-for-7-3/7-3-2-6-Compute-a-3x3-determinant.xml",
+            "category": "HELM/Course_quiz_7_3-determinants/top/Default-for-7-3"
+        },
+        "q_f5234b6e742ca1a4": {
+            "id": "q_f5234b6e742ca1a4",
+            "name": "7.3.3.2 Evaluate a 4x4 determinant",
+            "filename": "7-3-3-2-Evaluate-a-4x4-determinant.xml",
+            "path": "HELM/Course_quiz_7_3-determinants/top/Default-for-7-3/7-3-3-2-Evaluate-a-4x4-determinant.xml",
+            "category": "HELM/Course_quiz_7_3-determinants/top/Default-for-7-3"
+        },
+        "q_6e1b8eda713712b9": {
+            "id": "q_6e1b8eda713712b9",
+            "name": "7.3.4.1 Exercise 1",
+            "filename": "7-3-4-1-Exercise-1.xml",
+            "path": "HELM/Course_quiz_7_3-determinants/top/Default-for-7-3/7-3-4-1-Exercise-1.xml",
+            "category": "HELM/Course_quiz_7_3-determinants/top/Default-for-7-3"
+        },
+        "q_080a9b4087fc3ab2": {
+            "id": "q_080a9b4087fc3ab2",
+            "name": "7.3.4.2 Exercise 2 (NOT IN QUIZ)",
+            "filename": "7-3-4-2-Exercise-2-(NOT-IN-QUIZ).xml",
+            "path": "HELM/Course_quiz_7_3-determinants/top/Default-for-7-3/7-3-4-2-Exercise-2-(NOT-IN-QUIZ).xml",
+            "category": "HELM/Course_quiz_7_3-determinants/top/Default-for-7-3"
+        },
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+            "name": "PT.7.5 (Two linear sim. eqns with fractional coefficients)",
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+            "path": "Introductory-Mathematics/Week-07---Simultaneous-Equations/PT-7-5-(Two-linear-sim-eqns-with-fractional-coefficients).xml",
+            "category": "Introductory-Mathematics/Week-07---Simultaneous-Equations"
+        },
+        "q_2bdf2344715f5e9d": {
+            "id": "q_2bdf2344715f5e9d",
+            "name": "PT.7.6 (Parabola - line intersection)",
+            "filename": "PT-7-6-(Parabola---line-intersection).xml",
+            "path": "Introductory-Mathematics/Week-07---Simultaneous-Equations/PT-7-6-(Parabola---line-intersection).xml",
+            "category": "Introductory-Mathematics/Week-07---Simultaneous-Equations"
+        },
+        "q_a885c7410b3b6ad6": {
+            "id": "q_a885c7410b3b6ad6",
+            "name": "PT.7.7 (Two linear sim. eqns with fractions 2)",
+            "filename": "PT-7-7-(Two-linear-sim-eqns-with-fractions-2).xml",
+            "path": "Introductory-Mathematics/Week-07---Simultaneous-Equations/PT-7-7-(Two-linear-sim-eqns-with-fractions-2).xml",
+            "category": "Introductory-Mathematics/Week-07---Simultaneous-Equations"
+        },
+        "q_be74a16611666729": {
+            "id": "q_be74a16611666729",
+            "name": "PT.7.8 (One lin. one quad. sim. eqns rearrange and factorise)",
+            "filename": "PT-7-8-(One-lin-one-quad-sim-eqns-rearrange-and-factorise).xml",
+            "path": "Introductory-Mathematics/Week-07---Simultaneous-Equations/PT-7-8-(One-lin-one-quad-sim-eqns-rearrange-and-factorise).xml",
+            "category": "Introductory-Mathematics/Week-07---Simultaneous-Equations"
+        },
+        "q_46f29791131118bf": {
+            "id": "q_46f29791131118bf",
+            "name": "PT.7.9 (Multiplying square matrices 3 by 3)",
+            "filename": "PT-7-9-(Multiplying-square-matrices-3-by-3).xml",
+            "path": "Introductory-Mathematics/Week-07---Simultaneous-Equations/PT-7-9-(Multiplying-square-matrices-3-by-3).xml",
+            "category": "Introductory-Mathematics/Week-07---Simultaneous-Equations"
+        },
+        "q_3a319604d5a2d599": {
+            "id": "q_3a319604d5a2d599",
+            "name": "8.0.11 (Compound interest sequence)",
+            "filename": "8-0-11-(Compound-interest-sequence).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-0-11-(Compound-interest-sequence).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_2c99feed7a41ac87": {
+            "id": "q_2c99feed7a41ac87",
+            "name": "8.0.12 (Compound interest sequence 2)",
+            "filename": "8-0-12-(Compound-interest-sequence-2).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-0-12-(Compound-interest-sequence-2).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_3452d5e2d27ffac7": {
+            "id": "q_3452d5e2d27ffac7",
+            "name": "8.0.14 (Given sequence, decide its properties 1)",
+            "filename": "8-0-14-(Given-sequence,-decide-its-properties-1).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-0-14-(Given-sequence,-decide-its-properties-1).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_20cdef7778dc2300": {
+            "id": "q_20cdef7778dc2300",
+            "name": "8.0.15 (Given sequence, decide its properties 2)",
+            "filename": "8-0-15-(Given-sequence,-decide-its-properties-2).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-0-15-(Given-sequence,-decide-its-properties-2).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_a0b87fb038ed5b4e": {
+            "id": "q_a0b87fb038ed5b4e",
+            "name": "8.0.16 (Give example of sequence increasing bdd above)",
+            "filename": "8-0-16-(Give-example-of-sequence-increasing-bdd-above).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-0-16-(Give-example-of-sequence-increasing-bdd-above).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_531ef095afdc6b37": {
+            "id": "q_531ef095afdc6b37",
+            "name": "8.0.17 (Which are increasing?)",
+            "filename": "8-0-17-(Which-are-increasing-).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-0-17-(Which-are-increasing-).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_88d3257356d30ff6": {
+            "id": "q_88d3257356d30ff6",
+            "name": "8.0.18 (Give examples with properties)",
+            "filename": "8-0-18-(Give-examples-with-properties).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-0-18-(Give-examples-with-properties).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_b19a4c511ffa9be1": {
+            "id": "q_b19a4c511ffa9be1",
+            "name": "8.0.2 (Plausible nth term 1)",
+            "filename": "8-0-2-(Plausible-nth-term-1).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-0-2-(Plausible-nth-term-1).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_b6287197580a3e93": {
+            "id": "q_b6287197580a3e93",
+            "name": "8.0.20 (Which are periodic?)",
+            "filename": "8-0-20-(Which-are-periodic-).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-0-20-(Which-are-periodic-).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_51f86a8349488414": {
+            "id": "q_51f86a8349488414",
+            "name": "8.0.21 (Which are periodic? 2)",
+            "filename": "8-0-21-(Which-are-periodic-2).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-0-21-(Which-are-periodic-2).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_72483e9266e49677": {
+            "id": "q_72483e9266e49677",
+            "name": "8.0.24 (Rationalise hence find limit)",
+            "filename": "8-0-24-(Rationalise-hence-find-limit).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-0-24-(Rationalise-hence-find-limit).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_25d49d74e2e8671a": {
+            "id": "q_25d49d74e2e8671a",
+            "name": "8.0.25 (Rationalise hence find limit 2)",
+            "filename": "8-0-25-(Rationalise-hence-find-limit-2).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-0-25-(Rationalise-hence-find-limit-2).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_6460064f2ecbd58e": {
+            "id": "q_6460064f2ecbd58e",
+            "name": "8.0.26 (Find limit (1/a)^k)",
+            "filename": "8-0-26-(Find-limit-(1-a)^k).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-0-26-(Find-limit-(1-a)^k).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_7a1fb145760ca09f": {
+            "id": "q_7a1fb145760ca09f",
+            "name": "8.0.3 (Plausible nth term 2)",
+            "filename": "8-0-3-(Plausible-nth-term-2).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-0-3-(Plausible-nth-term-2).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_4e22e1ce18a9ca3a": {
+            "id": "q_4e22e1ce18a9ca3a",
+            "name": "8.0.4 (Using formula to generate terms)",
+            "filename": "8-0-4-(Using-formula-to-generate-terms).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-0-4-(Using-formula-to-generate-terms).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_339e77e4efcec645": {
+            "id": "q_339e77e4efcec645",
+            "name": "8.0.6 (Fibonacci terms)",
+            "filename": "8-0-6-(Fibonacci-terms).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-0-6-(Fibonacci-terms).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_68b4a9e0e4fd2918": {
+            "id": "q_68b4a9e0e4fd2918",
+            "name": "8.0.7 (Fibonacci terms with different starting values)",
+            "filename": "8-0-7-(Fibonacci-terms-with-different-starting-values).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-0-7-(Fibonacci-terms-with-different-starting-values).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_97ddf0e6486b8610": {
+            "id": "q_97ddf0e6486b8610",
+            "name": "8.0.8 (Write a recurrence relation for a given sequence)",
+            "filename": "8-0-8-(Write-a-recurrence-relation-for-a-given-sequence).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-0-8-(Write-a-recurrence-relation-for-a-given-sequence).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_03a1fa48026617ec": {
+            "id": "q_03a1fa48026617ec",
+            "name": "8.1.10 (Given arith sequence, decide its properties)",
+            "filename": "8-1-10-(Given-arith-sequence,-decide-its-properties).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-1-10-(Given-arith-sequence,-decide-its-properties).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_ca2bc59685e7fe05": {
+            "id": "q_ca2bc59685e7fe05",
+            "name": "8.1.12 (Find the common ratio)",
+            "filename": "8-1-12-(Find-the-common-ratio).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-1-12-(Find-the-common-ratio).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_82406f1509dfdbf0": {
+            "id": "q_82406f1509dfdbf0",
+            "name": "8.1.13 (Find the common ratio 2)",
+            "filename": "8-1-13-(Find-the-common-ratio-2).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-1-13-(Find-the-common-ratio-2).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_876db20c48734d12": {
+            "id": "q_876db20c48734d12",
+            "name": "8.1.14 (Term of GP from other term and ratio)",
+            "filename": "8-1-14-(Term-of-GP-from-other-term-and-ratio).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-1-14-(Term-of-GP-from-other-term-and-ratio).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_16cafbca469c350b": {
+            "id": "q_16cafbca469c350b",
+            "name": "8.1.15 (Given terms find u_n gp)",
+            "filename": "8-1-15-(Given-terms-find-u_n-gp).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-1-15-(Given-terms-find-u_n-gp).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_311ea12f96a42d31": {
+            "id": "q_311ea12f96a42d31",
+            "name": "8.1.16 (Given terms find u_n gp 2)",
+            "filename": "8-1-16-(Given-terms-find-u_n-gp-2).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-1-16-(Given-terms-find-u_n-gp-2).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_481f73851f767372": {
+            "id": "q_481f73851f767372",
+            "name": "8.1.17 (Which geo seq are converging?)",
+            "filename": "8-1-17-(Which-geo-seq-are-converging-).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-1-17-(Which-geo-seq-are-converging-).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_b88590d3737dc8d4": {
+            "id": "q_b88590d3737dc8d4",
+            "name": "8.1.18 (Given geo sequence, decide its properties)",
+            "filename": "8-1-18-(Given-geo-sequence,-decide-its-properties).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-1-18-(Given-geo-sequence,-decide-its-properties).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_5d38f09ec9feacb5": {
+            "id": "q_5d38f09ec9feacb5",
+            "name": "8.1.2 (AP. given terms, find u_n)",
+            "filename": "8-1-2-(AP-given-terms,-find-u_n).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-1-2-(AP-given-terms,-find-u_n).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_ed3e362e008ca6ba": {
+            "id": "q_ed3e362e008ca6ba",
+            "name": "8.1.20 (Arith. seq. savings)",
+            "filename": "8-1-20-(Arith-seq-savings).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-1-20-(Arith-seq-savings).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_74192ba50e43f128": {
+            "id": "q_74192ba50e43f128",
+            "name": "8.1.21 (Arith. seq. savings 2)",
+            "filename": "8-1-21-(Arith-seq-savings-2).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-1-21-(Arith-seq-savings-2).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_06b3e2a0c1842fa4": {
+            "id": "q_06b3e2a0c1842fa4",
+            "name": "8.1.22 (Artih.seq. animal population)",
+            "filename": "8-1-22-(Artih-seq-animal-population).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-1-22-(Artih-seq-animal-population).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_9cf9d83917c2d013": {
+            "id": "q_9cf9d83917c2d013",
+            "name": "8.1.23 (Geom. seq. calculate salary)",
+            "filename": "8-1-23-(Geom-seq-calculate-salary).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-1-23-(Geom-seq-calculate-salary).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_afcd9447274a1991": {
+            "id": "q_afcd9447274a1991",
+            "name": "8.1.24 (Geom. seq. choose salary)",
+            "filename": "8-1-24-(Geom-seq-choose-salary).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-1-24-(Geom-seq-choose-salary).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_4cf3b22c11443896": {
+            "id": "q_4cf3b22c11443896",
+            "name": "8.1.25 (Geom. seq. choose salary 2)",
+            "filename": "8-1-25-(Geom-seq-choose-salary-2).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-1-25-(Geom-seq-choose-salary-2).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_10dc9e72bd2b8d24": {
+            "id": "q_10dc9e72bd2b8d24",
+            "name": "8.1.3 (AP. given terms, find u_n 2)",
+            "filename": "8-1-3-(AP-given-terms,-find-u_n-2).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-1-3-(AP-given-terms,-find-u_n-2).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_e9f6394296afd148": {
+            "id": "q_e9f6394296afd148",
+            "name": "8.1.4 (Arithmetic seq find missing value)",
+            "filename": "8-1-4-(Arithmetic-seq-find-missing-value).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-1-4-(Arithmetic-seq-find-missing-value).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_9b9600e4806ca149": {
+            "id": "q_9b9600e4806ca149",
+            "name": "8.1.5 (Arithmetic seq find missing value 2)",
+            "filename": "8-1-5-(Arithmetic-seq-find-missing-value-2).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-1-5-(Arithmetic-seq-find-missing-value-2).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_10c10ae74d169613": {
+            "id": "q_10c10ae74d169613",
+            "name": "8.1.5 (Which are arith seqs?)",
+            "filename": "8-1-5-(Which-are-arith-seqs-).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-1-5-(Which-are-arith-seqs-).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_a0c436d73022a09d": {
+            "id": "q_a0c436d73022a09d",
+            "name": "8.1.6 (Which are arith seqs? 2)",
+            "filename": "8-1-6-(Which-are-arith-seqs-2).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-1-6-(Which-are-arith-seqs-2).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_fdbf247233352d0e": {
+            "id": "q_fdbf247233352d0e",
+            "name": "8.1.7 (Write arithmetic sequence)",
+            "filename": "8-1-7-(Write-arithmetic-sequence).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-1-7-(Write-arithmetic-sequence).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_3519cbae07d64fb9": {
+            "id": "q_3519cbae07d64fb9",
+            "name": "8.1.8 (Write arithmetic sequence 2)",
+            "filename": "8-1-8-(Write-arithmetic-sequence-2).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-1-8-(Write-arithmetic-sequence-2).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_ec708cabd28df6c9": {
+            "id": "q_ec708cabd28df6c9",
+            "name": "8.1.9 (Write arithmetic sequence 3)",
+            "filename": "8-1-9-(Write-arithmetic-sequence-3).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-1-9-(Write-arithmetic-sequence-3).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_8416932219dda6ee": {
+            "id": "q_8416932219dda6ee",
+            "name": "8.2.10 (Find upper lim and expr, twice)",
+            "filename": "8-2-10-(Find-upper-lim-and-expr,-twice).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-2-10-(Find-upper-lim-and-expr,-twice).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
+        "q_cab5ff62dde5a084": {
+            "id": "q_cab5ff62dde5a084",
+            "name": "8.2.13 (Which are correct sigma properties?)",
+            "filename": "8-2-13-(Which-are-correct-sigma-properties-).xml",
+            "path": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences/8-2-13-(Which-are-correct-sigma-properties-).xml",
+            "category": "Introductory-Mathematics/Week-08---Arithmetic-and-geometric-sequences"
+        },
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+            "id": "q_393a1d6096c0d3f5",
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+            "name": "9.0.10 (Find entry in Pascal 3)",
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+            "name": "9.0.12 (Evaluate binomial (scaffolded))",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-0-12-(Evaluate-binomial-(scaffolded)).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-0-13-(Evaluate-binomial-(scaffolded)-2).xml",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-0-14-(Evaluate-binomial-(scaffolded)-3).xml",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-0-2-(Evaluate-factorial).xml",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-0-4-(Evaluate-factorial-3).xml",
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+            "name": "9.0.5 (Factorial sum as product)",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-0-5-(Factorial-sum-as-product).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "name": "9.0.6 (Express fraction in terms of factorials)",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-0-6-(Express-fraction-in-terms-of-factorials).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+        "q_ff0db18b50e26e73": {
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+            "name": "9.0.8 (Find entry in Pascal)",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-0-8-(Find-entry-in-Pascal).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "name": "9.0.9 (Find entry in Pascal 2)",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-0-9-(Find-entry-in-Pascal-2).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "name": "9.1.10 (Restricted permutations of mathematics)",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-1-10-(Restricted-permutations-of-mathematics).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+        "q_5618828254445ccf": {
+            "id": "q_5618828254445ccf",
+            "name": "9.1.13 (Choosing student societies combinations)",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-1-13-(Choosing-student-societies-combinations).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "name": "9.1.14 (Groupings of students combinations)",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-1-14-(Groupings-of-students-combinations).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "name": "9.1.19 (Combinations number of theorems)",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-1-19-(Combinations-number-of-theorems).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "name": "9.1.20 (Evaluate binomial 3)",
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+            "name": "9.1.4 (Forming permutations of words)",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-1-4-(Forming-permutations-of-words).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+        "q_ba2f3156971f1dcc": {
+            "id": "q_ba2f3156971f1dcc",
+            "name": "9.1.6 (Tourist itineraries permutations)",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-1-6-(Tourist-itineraries-permutations).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "name": "9.1.7 (Permutations of marbles)",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-1-7-(Permutations-of-marbles).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "name": "9.1.8 (Permutations of mathematics)",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-1-8-(Permutations-of-mathematics).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "name": "9.1.9 (Rearranging word permutation)",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-1-9-(Rearranging-word-permutation).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "name": "9.2.10 (Expand brackets alternating sign)",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-2-10-(Expand-brackets-alternating-sign).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "name": "9.2.13 (Expand up to nth term)",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-2-13-(Expand-up-to-nth-term).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "name": "9.2.19 (Find coefficient x^k)",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-2-19-(Find-coefficient-x^k).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-2-2-(Find-x^4-term).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "name": "9.2.20 (Find a if know coef of x^k)",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-2-20-(Find-a-if-know-coef-of-x^k).xml",
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+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "name": "9.2.22 (General term of binomial 2)",
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+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "name": "9.2.23 (General term of binomial 3)",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-2-23-(General-term-of-binomial-3).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "name": "9.2.3 (Find term in x^k in (x+y)^10)",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-2-3-(Find-term-in-x^k-in-(x+y)^10).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "name": "9.2.4 (Coefficient in expansion of 2 brackets)",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-2-4-(Coefficient-in-expansion-of-2-brackets).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "name": "9.2.6 (Expand brackets simple)",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-2-6-(Expand-brackets-simple).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "name": "9.2.8 (Expand brackets coefficient of y)",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-2-8-(Expand-brackets-coefficient-of-y).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "name": "9.2.9 (Expand brackets no y)",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-2-9-(Expand-brackets-no-y).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "id": "q_d3c2e6c2013aa73c",
+            "name": "9.3.10 (Partial fractions 2 linear factors (b: complete final two steps))",
+            "filename": "9-3-10-(Partial-fractions-2-linear-factors-(b-complete-final-two-steps)).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-3-10-(Partial-fractions-2-linear-factors-(b-complete-final-two-steps)).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "id": "q_50708a4d6e41c1d6",
+            "name": "9.3.11 (Partial fractions 2 linear factors (c: no scaffolding))",
+            "filename": "9-3-11-(Partial-fractions-2-linear-factors-(c-no-scaffolding)).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-3-11-(Partial-fractions-2-linear-factors-(c-no-scaffolding)).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+        "q_9bdfbe30cd104da0": {
+            "id": "q_9bdfbe30cd104da0",
+            "name": "9.3.13 (Partial fractions repeated linear factors (complete final two steps))",
+            "filename": "9-3-13-(Partial-fractions-repeated-linear-factors-(complete-final-two-steps)).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-3-13-(Partial-fractions-repeated-linear-factors-(complete-final-two-steps)).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+        "q_3bdb4b021ad5c5a3": {
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+            "name": "9.3.15 (Partial fractions 1lin 1quad)",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-3-15-(Partial-fractions-1lin-1quad).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+            "name": "9.3.16 (Partial fractions 1lin 1quad 2)",
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+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-3-16-(Partial-fractions-1lin-1quad-2).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
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+        "q_68d813796bc10aa1": {
+            "id": "q_68d813796bc10aa1",
+            "name": "9.3.17 (Partial fractions (improper, 2 linear factors))",
+            "filename": "9-3-17-(Partial-fractions-(improper,-2-linear-factors)).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-3-17-(Partial-fractions-(improper,-2-linear-factors)).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
+        },
+        "q_7f8781aa85911c0e": {
+            "id": "q_7f8781aa85911c0e",
+            "name": "9.3.18 (Partial fractions (improper, 2 linear factors) 2)",
+            "filename": "9-3-18-(Partial-fractions-(improper,-2-linear-factors)-2).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-3-18-(Partial-fractions-(improper,-2-linear-factors)-2).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
+        },
+        "q_1e2f2c31b84f3052": {
+            "id": "q_1e2f2c31b84f3052",
+            "name": "9.3.19 (Which is the correct partial fraction decomposition? (linear sq with irred quad))",
+            "filename": "9-3-19-(Which-is-the-correct-partial-fraction-decomposition-(linear-sq-with-irred-quad)).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-3-19-(Which-is-the-correct-partial-fraction-decomposition-(linear-sq-with-irred-quad)).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
+        },
+        "q_7b7a5d5e32f411fc": {
+            "id": "q_7b7a5d5e32f411fc",
+            "name": "9.3.2 (Binomial term independent of x)",
+            "filename": "9-3-2-(Binomial-term-independent-of-x).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-3-2-(Binomial-term-independent-of-x).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
+        },
+        "q_95053b79c0024fe8": {
+            "id": "q_95053b79c0024fe8",
+            "name": "9.3.20 (Which is the correct partial fraction decomposition? 2)",
+            "filename": "9-3-20-(Which-is-the-correct-partial-fraction-decomposition-2).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-3-20-(Which-is-the-correct-partial-fraction-decomposition-2).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
+        },
+        "q_df2c38355001d5bd": {
+            "id": "q_df2c38355001d5bd",
+            "name": "9.3.3 (Binomial term independent of x 2)",
+            "filename": "9-3-3-(Binomial-term-independent-of-x-2).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-3-3-(Binomial-term-independent-of-x-2).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
+        },
+        "q_900d0843cf52a976": {
+            "id": "q_900d0843cf52a976",
+            "name": "9.3.4 (Expand binomial - (2-3x)^4 type)",
+            "filename": "9-3-4-(Expand-binomial---(2-3x)^4-type).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-3-4-(Expand-binomial---(2-3x)^4-type).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
+        },
+        "q_616c95fc61bef7a3": {
+            "id": "q_616c95fc61bef7a3",
+            "name": "9.3.5 (Expand binomial - (2x+3)^4 type)",
+            "filename": "9-3-5-(Expand-binomial---(2x+3)^4-type).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-3-5-(Expand-binomial---(2x+3)^4-type).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
+        },
+        "q_8c0978de6dccb453": {
+            "id": "q_8c0978de6dccb453",
+            "name": "9.3.6 (Expand binomial - (2x-1)^4 type)",
+            "filename": "9-3-6-(Expand-binomial---(2x-1)^4-type).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-3-6-(Expand-binomial---(2x-1)^4-type).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
+        },
+        "q_5333eccf00f63510": {
+            "id": "q_5333eccf00f63510",
+            "name": "9.3.9 (Partial fractions 2 linear factors (a: complete the final step))",
+            "filename": "9-3-9-(Partial-fractions-2-linear-factors-(a-complete-the-final-step)).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-3-9-(Partial-fractions-2-linear-factors-(a-complete-the-final-step)).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
+        },
+        "q_34a63bd9973eb8c0": {
+            "id": "q_34a63bd9973eb8c0",
+            "name": "9.4.11 (Find Binomial probability borrowing money)",
+            "filename": "9-4-11-(Find-Binomial-probability-borrowing-money).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-4-11-(Find-Binomial-probability-borrowing-money).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
+        },
+        "q_fc0a887d28b7a760": {
+            "id": "q_fc0a887d28b7a760",
+            "name": "9.4.6 (Find Binomial probability)",
+            "filename": "9-4-6-(Find-Binomial-probability).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-4-6-(Find-Binomial-probability).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
+        },
+        "q_a6f0163770783757": {
+            "id": "q_a6f0163770783757",
+            "name": "9.4.7 (Find Binomial probability 2)",
+            "filename": "9-4-7-(Find-Binomial-probability-2).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-4-7-(Find-Binomial-probability-2).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
+        },
+        "q_c02737d81438edc0": {
+            "id": "q_c02737d81438edc0",
+            "name": "9.4.8 (Find Binomial probability 3)",
+            "filename": "9-4-8-(Find-Binomial-probability-3).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-4-8-(Find-Binomial-probability-3).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
+        },
+        "q_f7a119255c167c41": {
+            "id": "q_f7a119255c167c41",
+            "name": "9.4.9 (Find Binomial probability 4)",
+            "filename": "9-4-9-(Find-Binomial-probability-4).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/9-4-9-(Find-Binomial-probability-4).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
+        },
+        "q_2681163b2fa5a170": {
+            "id": "q_2681163b2fa5a170",
+            "name": "PT.9.1 (Evaluate factorial 2)",
+            "filename": "PT-9-1-(Evaluate-factorial-2).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/PT-9-1-(Evaluate-factorial-2).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
+        },
+        "q_e5eb7e0d39e91648": {
+            "id": "q_e5eb7e0d39e91648",
+            "name": "PT.9.10 (Expand brackets coefficient of y)",
+            "filename": "PT-9-10-(Expand-brackets-coefficient-of-y).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/PT-9-10-(Expand-brackets-coefficient-of-y).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
+        },
+        "q_935097a75deb9074": {
+            "id": "q_935097a75deb9074",
+            "name": "PT.9.11 (Binomial?)",
+            "filename": "PT-9-11-(Binomial-).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/PT-9-11-(Binomial-).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
+        },
+        "q_6e99b63a68914e35": {
+            "id": "q_6e99b63a68914e35",
+            "name": "PT.9.12 (Partial fractions 1lin 1quad)",
+            "filename": "PT-9-12-(Partial-fractions-1lin-1quad).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/PT-9-12-(Partial-fractions-1lin-1quad).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
+        },
+        "q_b79a73be1d2c0020": {
+            "id": "q_b79a73be1d2c0020",
+            "name": "PT.9.2 (Evaluate binomial (scaffolded))",
+            "filename": "PT-9-2-(Evaluate-binomial-(scaffolded)).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/PT-9-2-(Evaluate-binomial-(scaffolded)).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
+        },
+        "q_cead820b6a96503b": {
+            "id": "q_cead820b6a96503b",
+            "name": "PT.9.3 (Find entry in Pascal)",
+            "filename": "PT-9-3-(Find-entry-in-Pascal).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/PT-9-3-(Find-entry-in-Pascal).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
+        },
+        "q_549f082e7c0d0c54": {
+            "id": "q_549f082e7c0d0c54",
+            "name": "PT.9.4 (Which is the correct partial fraction decomposition?)",
+            "filename": "PT-9-4-(Which-is-the-correct-partial-fraction-decomposition-).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/PT-9-4-(Which-is-the-correct-partial-fraction-decomposition-).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
+        },
+        "q_ca94d837353e1985": {
+            "id": "q_ca94d837353e1985",
+            "name": "PT.9.5 (Choosing student societies combinations)",
+            "filename": "PT-9-5-(Choosing-student-societies-combinations).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/PT-9-5-(Choosing-student-societies-combinations).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
+        },
+        "q_f36280b8f50ae9e9": {
+            "id": "q_f36280b8f50ae9e9",
+            "name": "PT.9.6 (Tourist itineraries permutations)",
+            "filename": "PT-9-6-(Tourist-itineraries-permutations).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/PT-9-6-(Tourist-itineraries-permutations).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
+        },
+        "q_c5a7801d0ef54f0e": {
+            "id": "q_c5a7801d0ef54f0e",
+            "name": "PT.9.7 (Factorial simplifications)",
+            "filename": "PT-9-7-(Factorial-simplifications).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/PT-9-7-(Factorial-simplifications).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
+        },
+        "q_2e92ec2e90556849": {
+            "id": "q_2e92ec2e90556849",
+            "name": "PT.9.8 (Expand up to nth term)",
+            "filename": "PT-9-8-(Expand-up-to-nth-term).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/PT-9-8-(Expand-up-to-nth-term).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
+        },
+        "q_f3aeb7250207faf7": {
+            "id": "q_f3aeb7250207faf7",
+            "name": "PT.9.9 (General term of binomial 2)",
+            "filename": "PT-9-9-(General-term-of-binomial-2).xml",
+            "path": "Introductory-Mathematics/Week-09---The-Binomial-theorem/PT-9-9-(General-term-of-binomial-2).xml",
+            "category": "Introductory-Mathematics/Week-09---The-Binomial-theorem"
+        },
+        "q_367b7bc4d85abd9d": {
+            "id": "q_367b7bc4d85abd9d",
+            "name": "10.0.10 (Finding limits rational)",
+            "filename": "10-0-10-(Finding-limits-rational).xml",
+            "path": "Introductory-Mathematics/Week-10---Calculus-Concepts/10-0-10-(Finding-limits-rational).xml",
+            "category": "Introductory-Mathematics/Week-10---Calculus-Concepts"
+        },
+        "q_f043179b16a72e19": {
+            "id": "q_f043179b16a72e19",
+            "name": "10.0.11 (Finding limits rational 2)",
+            "filename": "10-0-11-(Finding-limits-rational-2).xml",
+            "path": "Introductory-Mathematics/Week-10---Calculus-Concepts/10-0-11-(Finding-limits-rational-2).xml",
+            "category": "Introductory-Mathematics/Week-10---Calculus-Concepts"
+        },
+        "q_982f57c90550f5da": {
+            "id": "q_982f57c90550f5da",
+            "name": "10.0.12 (Finding limits quadratic over linear)",
+            "filename": "10-0-12-(Finding-limits-quadratic-over-linear).xml",
+            "path": "Introductory-Mathematics/Week-10---Calculus-Concepts/10-0-12-(Finding-limits-quadratic-over-linear).xml",
+            "category": "Introductory-Mathematics/Week-10---Calculus-Concepts"
+        },
+        "q_212e001e65f1256d": {
+            "id": "q_212e001e65f1256d",
+            "name": "10.0.13 (Finding limits quad over quad)",
+            "filename": "10-0-13-(Finding-limits-quad-over-quad).xml",
+            "path": "Introductory-Mathematics/Week-10---Calculus-Concepts/10-0-13-(Finding-limits-quad-over-quad).xml",
+            "category": "Introductory-Mathematics/Week-10---Calculus-Concepts"
+        },
+        "q_41fc98cb2d07a795": {
+            "id": "q_41fc98cb2d07a795",
+            "name": "10.0.14 (Finding limits quad over quad 2)",
+            "filename": "10-0-14-(Finding-limits-quad-over-quad-2).xml",
+            "path": "Introductory-Mathematics/Week-10---Calculus-Concepts/10-0-14-(Finding-limits-quad-over-quad-2).xml",
+            "category": "Introductory-Mathematics/Week-10---Calculus-Concepts"
+        },
+        "q_bf43a893f9d0aa19": {
+            "id": "q_bf43a893f9d0aa19",
+            "name": "10.0.15 (Finding limits quad over cube)",
+            "filename": "10-0-15-(Finding-limits-quad-over-cube).xml",
+            "path": "Introductory-Mathematics/Week-10---Calculus-Concepts/10-0-15-(Finding-limits-quad-over-cube).xml",
+            "category": "Introductory-Mathematics/Week-10---Calculus-Concepts"
+        },
+        "q_b5c7b9f54a2e80ec": {
+            "id": "q_b5c7b9f54a2e80ec",
+            "name": "10.0.18 (Finding gradient of tangent at a point one power)",
+            "filename": "10-0-18-(Finding-gradient-of-tangent-at-a-point-one-power).xml",
+            "path": "Introductory-Mathematics/Week-10---Calculus-Concepts/10-0-18-(Finding-gradient-of-tangent-at-a-point-one-power).xml",
+            "category": "Introductory-Mathematics/Week-10---Calculus-Concepts"
+        },
+        "q_90303d8c5d4bfac9": {
+            "id": "q_90303d8c5d4bfac9",
+            "name": "10.0.19 (Finding gradient of tangent at a point one power 2)",
+            "filename": "10-0-19-(Finding-gradient-of-tangent-at-a-point-one-power-2).xml",
+            "path": "Introductory-Mathematics/Week-10---Calculus-Concepts/10-0-19-(Finding-gradient-of-tangent-at-a-point-one-power-2).xml",
+            "category": "Introductory-Mathematics/Week-10---Calculus-Concepts"
+        },
+        "q_a0ce1e47af97f6c3": {
+            "id": "q_a0ce1e47af97f6c3",
+            "name": "10.0.2 (Constant rate of change)",
+            "filename": "10-0-2-(Constant-rate-of-change).xml",
+            "path": "Introductory-Mathematics/Week-10---Calculus-Concepts/10-0-2-(Constant-rate-of-change).xml",
+            "category": "Introductory-Mathematics/Week-10---Calculus-Concepts"
+        },
+        "q_4d438c25b0469888": {
+            "id": "q_4d438c25b0469888",
+            "name": "10.0.20 (Finding gradient of tangent at a point power - const)",
+            "filename": "10-0-20-(Finding-gradient-of-tangent-at-a-point-power---const).xml",
+            "path": "Introductory-Mathematics/Week-10---Calculus-Concepts/10-0-20-(Finding-gradient-of-tangent-at-a-point-power---const).xml",
+            "category": "Introductory-Mathematics/Week-10---Calculus-Concepts"
+        },
+        "q_3394ab6e4603dd66": {
+            "id": "q_3394ab6e4603dd66",
+            "name": "10.0.21 (Finding gradient of tangent at a point polyn)",
+            "filename": "10-0-21-(Finding-gradient-of-tangent-at-a-point-polyn).xml",
+            "path": "Introductory-Mathematics/Week-10---Calculus-Concepts/10-0-21-(Finding-gradient-of-tangent-at-a-point-polyn).xml",
+            "category": "Introductory-Mathematics/Week-10---Calculus-Concepts"
+        },
+        "q_474c7d4ef5c1ac94": {
+            "id": "q_474c7d4ef5c1ac94",
+            "name": "10.0.4 (Average rate of change)",
+            "filename": "10-0-4-(Average-rate-of-change).xml",
+            "path": "Introductory-Mathematics/Week-10---Calculus-Concepts/10-0-4-(Average-rate-of-change).xml",
+            "category": "Introductory-Mathematics/Week-10---Calculus-Concepts"
+        },
+        "q_e9da74aa00cb7910": {
+            "id": "q_e9da74aa00cb7910",
+            "name": "10.0.8 (Finding limits trig)",
+            "filename": "10-0-8-(Finding-limits-trig).xml",
+            "path": "Introductory-Mathematics/Week-10---Calculus-Concepts/10-0-8-(Finding-limits-trig).xml",
+            "category": "Introductory-Mathematics/Week-10---Calculus-Concepts"
+        },
+        "q_e4ccc22e5eb1e5f2": {
+            "id": "q_e4ccc22e5eb1e5f2",
+            "name": "10.0.9 (Finding limits trig 2)",
+            "filename": "10-0-9-(Finding-limits-trig-2).xml",
+            "path": "Introductory-Mathematics/Week-10---Calculus-Concepts/10-0-9-(Finding-limits-trig-2).xml",
+            "category": "Introductory-Mathematics/Week-10---Calculus-Concepts"
+        },
+        "q_5b7c9cb2b9201fb2": {
+            "id": "q_5b7c9cb2b9201fb2",
+            "name": "10.1.11 (Diff poly and trig)",
+            "filename": "10-1-11-(Diff-poly-and-trig).xml",
+            "path": "Introductory-Mathematics/Week-10---Calculus-Concepts/10-1-11-(Diff-poly-and-trig).xml",
+            "category": "Introductory-Mathematics/Week-10---Calculus-Concepts"
+        },
+        "q_ce9e0b6a4a127667": {
+            "id": "q_ce9e0b6a4a127667",
+            "name": "10.1.12 (CR-Diff-02-linearity-1.b edited)",
+            "filename": "10-1-12-(CR-Diff-02-linearity-1-b-edited).xml",
+            "path": "Introductory-Mathematics/Week-10---Calculus-Concepts/10-1-12-(CR-Diff-02-linearity-1-b-edited).xml",
+            "category": "Introductory-Mathematics/Week-10---Calculus-Concepts"
+        },
+        "q_3c993c9b166594f5": {
+            "id": "q_3c993c9b166594f5",
+            "name": "10.1.13 (CR-Diff-02-linearity-2.a)",
+            "filename": "10-1-13-(CR-Diff-02-linearity-2-a).xml",
+            "path": "Introductory-Mathematics/Week-10---Calculus-Concepts/10-1-13-(CR-Diff-02-linearity-2-a).xml",
+            "category": "Introductory-Mathematics/Week-10---Calculus-Concepts"
+        },
+        "q_96d38041c1121df5": {
+            "id": "q_96d38041c1121df5",
+            "name": "10.1.16 (Diff sum of trig)",
+            "filename": "10-1-16-(Diff-sum-of-trig).xml",
+            "path": "Introductory-Mathematics/Week-10---Calculus-Concepts/10-1-16-(Diff-sum-of-trig).xml",
+            "category": "Introductory-Mathematics/Week-10---Calculus-Concepts"
+        },
+        "q_18c9794810d6b389": {
+            "id": "q_18c9794810d6b389",
+            "name": "10.1.17 (Linearity of differentiation)",
+            "filename": "10-1-17-(Linearity-of-differentiation).xml",
+            "path": "Introductory-Mathematics/Week-10---Calculus-Concepts/10-1-17-(Linearity-of-differentiation).xml",
+            "category": "Introductory-Mathematics/Week-10---Calculus-Concepts"
+        },
+        "q_b6a0ca775c84f10b": {
+            "id": "q_b6a0ca775c84f10b",
+            "name": "10.1.18 (Diff quadratic CAP W2 Q04 used edited)",
+            "filename": "10-1-18-(Diff-quadratic-CAP-W2-Q04-used-edited).xml",
+            "path": "Introductory-Mathematics/Week-10---Calculus-Concepts/10-1-18-(Diff-quadratic-CAP-W2-Q04-used-edited).xml",
+            "category": "Introductory-Mathematics/Week-10---Calculus-Concepts"
+        },
+        "q_f863658def20661a": {
+            "id": "q_f863658def20661a",
+            "name": "10.1.19 (Expand and diff CAP W2 11 unused edited)",
+            "filename": "10-1-19-(Expand-and-diff-CAP-W2-11-unused-edited).xml",
+            "path": "Introductory-Mathematics/Week-10---Calculus-Concepts/10-1-19-(Expand-and-diff-CAP-W2-11-unused-edited).xml",
+            "category": "Introductory-Mathematics/Week-10---Calculus-Concepts"
+        },
+        "q_4af3914449f7f8ee": {
+            "id": "q_4af3914449f7f8ee",
+            "name": "10.1.4 (Finding derivatives from first principals)",
+            "filename": "10-1-4-(Finding-derivatives-from-first-principals).xml",
+            "path": "Introductory-Mathematics/Week-10---Calculus-Concepts/10-1-4-(Finding-derivatives-from-first-principals).xml",
+            "category": "Introductory-Mathematics/Week-10---Calculus-Concepts"
+        },
+        "q_d49fb4e7e078a03a": {
+            "id": "q_d49fb4e7e078a03a",
+            "name": "10.1.6 (Diff of one power)",
+            "filename": "10-1-6-(Diff-of-one-power).xml",
+            "path": "Introductory-Mathematics/Week-10---Calculus-Concepts/10-1-6-(Diff-of-one-power).xml",
+            "category": "Introductory-Mathematics/Week-10---Calculus-Concepts"
+        },
+        "q_d80e22c613ba2082": {
+            "id": "q_d80e22c613ba2082",
+            "name": "10.1.7 (Differentiate constant)",
+            "filename": "10-1-7-(Differentiate-constant).xml",
+            "path": "Introductory-Mathematics/Week-10---Calculus-Concepts/10-1-7-(Differentiate-constant).xml",
+            "category": "Introductory-Mathematics/Week-10---Calculus-Concepts"
+        },
+        "q_edf57d8973d03e33": {
+            "id": "q_edf57d8973d03e33",
+            "name": "10.1.8 (Diff fractional power)",
+            "filename": "10-1-8-(Diff-fractional-power).xml",
+            "path": "Introductory-Mathematics/Week-10---Calculus-Concepts/10-1-8-(Diff-fractional-power).xml",
+            "category": "Introductory-Mathematics/Week-10---Calculus-Concepts"
+        },
+        "q_b2a0abc562aba0eb": {
+            "id": "q_b2a0abc562aba0eb",
+            "name": "10.2.10 (Tangent lines)",
+            "filename": "10-2-10-(Tangent-lines).xml",
+            "path": "Introductory-Mathematics/Week-10---Calculus-Concepts/10-2-10-(Tangent-lines).xml",
+            "category": "Introductory-Mathematics/Week-10---Calculus-Concepts"
+        },
+        "q_f494db7d72e48d6a": {
+            "id": "q_f494db7d72e48d6a",
+            "name": "10.2.11 (Big slope of quadratic)",
+            "filename": "10-2-11-(Big-slope-of-quadratic).xml",
+            "path": "Introductory-Mathematics/Week-10---Calculus-Concepts/10-2-11-(Big-slope-of-quadratic).xml",
+            "category": "Introductory-Mathematics/Week-10---Calculus-Concepts"
+        },
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+        "q_6cb4165667b63ef5": {
+            "id": "q_6cb4165667b63ef5",
+            "name": "Q02 Q8 Proof by induction (general) sum (2k-1)^3  = n^2(2n^2-1)",
+            "filename": "Proof_gaps_induction_series.xml",
+            "path": "Topics/Proof/Proof_gaps_induction_series.xml",
+            "category": "Topics/Proof"
+        },
+        "q_2880ef1c44f8c28a": {
+            "id": "q_2880ef1c44f8c28a",
+            "name": "Series_1",
+            "filename": "Series_1.xml",
+            "path": "Topics/Series/Maclaurin-Series/Series_1.xml",
+            "category": "Topics/Series/Maclaurin-Series"
+        },
+        "q_b7fd1bc43f6d75d5": {
+            "id": "q_b7fd1bc43f6d75d5",
+            "name": "Series_2",
+            "filename": "Series_2.xml",
+            "path": "Topics/Series/Maclaurin-Series/Series_2.xml",
+            "category": "Topics/Series/Maclaurin-Series"
+        },
+        "q_bab6e4e0f78133f5": {
+            "id": "q_bab6e4e0f78133f5",
+            "name": "Series_3",
+            "filename": "Series_3.xml",
+            "path": "Topics/Series/Maclaurin-Series/Series_3.xml",
+            "category": "Topics/Series/Maclaurin-Series"
+        },
+        "q_6b88b850a09a81be": {
+            "id": "q_6b88b850a09a81be",
+            "name": "Cartesian_Set_1",
+            "filename": "Cartesian_Set_1.xml",
+            "path": "Topics/Sets/Cartesian_Set_1.xml",
+            "category": "Topics/Sets"
+        },
+        "q_e31e48ebf1928b7b": {
+            "id": "q_e31e48ebf1928b7b",
+            "name": "Set_1",
+            "filename": "Set_1.xml",
+            "path": "Topics/Sets/Set_1.xml",
+            "category": "Topics/Sets"
+        },
+        "q_d5bff4b46a09e8b0": {
+            "id": "q_d5bff4b46a09e8b0",
+            "name": "Set_Intersection_1",
+            "filename": "Set_Intersection_1.xml",
+            "path": "Topics/Sets/Set_Intersection_1.xml",
+            "category": "Topics/Sets"
+        },
+        "q_af65621ee0bd2fa1": {
+            "id": "q_af65621ee0bd2fa1",
+            "name": "Set_Intersection_2",
+            "filename": "Set_Intersection_2.xml",
+            "path": "Topics/Sets/Set_Intersection_2.xml",
+            "category": "Topics/Sets"
+        },
+        "q_e5b85113b60a758d": {
+            "id": "q_e5b85113b60a758d",
+            "name": "Set_Interval_1",
+            "filename": "Set_Interval_1.xml",
+            "path": "Topics/Sets/Set_Interval_1.xml",
+            "category": "Topics/Sets"
+        },
+        "q_47fb86c25a91817f": {
+            "id": "q_47fb86c25a91817f",
+            "name": "Set_Interval_2",
+            "filename": "Set_Interval_2.xml",
+            "path": "Topics/Sets/Set_Interval_2.xml",
+            "category": "Topics/Sets"
+        },
+        "q_957bea88086e7502": {
+            "id": "q_957bea88086e7502",
+            "name": "Subset_1",
+            "filename": "Subset_1.xml",
+            "path": "Topics/Sets/Subset_1.xml",
+            "category": "Topics/Sets"
+        }
+    }
+}
diff --git a/api/public/stackshared.js b/api/public/stackshared.js
index 7c8a307d7ee..fe72744d764 100644
--- a/api/public/stackshared.js
+++ b/api/public/stackshared.js
@@ -27,11 +27,12 @@ const feedbackPrefix = 'stackapi_fb_';
 const validationPrefix = 'stackapi_val_';
 const FULLDISPLAY = 'FULL';
 const SAMPLEDISPLAY = 'SAMPLE';
+const stackApiDemoConfig = window.stackApiDemoConfig || {};
 // Set API server here with trailing slash e.g. 'https://stack-api.maths.ed.ac.uk/'.
 // Leave as is if page is on the same server e.g. for STACK API demo.
-const serverUrl = '/';
-const requestLanguage = 'en';
-let displayType = FULLDISPLAY;
+const serverUrl = stackApiDemoConfig.serverUrl || '/';
+const requestLanguage = stackApiDemoConfig.requestLanguage || 'en';
+let displayType = stackApiDemoConfig.displayType || FULLDISPLAY;
 
 // Get the different input elements by tag and return object with values.
 function collectAnswer() {
@@ -366,7 +367,7 @@ function answer() {
 function renameIframeHolders() {
     // Each call to STACK restarts numbering of iframe holders so we need to rename
     // any old ones to make sure new iframes end up in the correct place.
-    for (const iframe of document.querySelectorAll(`[id^=stack-iframe-holder]:not([id$=old]`)) {
+    for (const iframe of document.querySelectorAll('[id^=stack-iframe-holder]:not([id$=old])')) {
         iframe.id = iframe.id + '_old';
     }
 }

From 0090e11b371ff95fbf0f720ab2ca56325743b27d Mon Sep 17 00:00:00 2001
From: Edmund Farrow <edmund.farrow@ed.ac.uk>
Date: Thu, 30 Jul 2026 12:09:24 +0100
Subject: [PATCH 02/10] api-frontend - Docs and move manifest

---
 api/README.md                                 |    89 +-
 ...fileFrontendDemo => DockerfilePrivateDemo} |     4 +-
 ...ml => docker-compose.demo-private.dev.yml} |     9 +-
 ...ry.yml => docker-compose.demo-private.yml} |     1 +
 api/private-demo/assets/.gitignore            |     2 +
 api/private-demo/build_manifest.php           |    15 +-
 api/private-demo/lib.php                      |    12 +-
 api/private-demo/public/notes.php             |     2 +-
 api/private-demo/question-manifest.json       | 17848 ----------------
 9 files changed, 94 insertions(+), 17888 deletions(-)
 rename api/docker/{DockerfileFrontendDemo => DockerfilePrivateDemo} (91%)
 rename api/docker/{docker-compose.demo-private-library.dev.yml => docker-compose.demo-private.dev.yml} (79%)
 rename api/docker/{docker-compose.demo-private-library.yml => docker-compose.demo-private.yml} (94%)
 create mode 100644 api/private-demo/assets/.gitignore
 delete mode 100644 api/private-demo/question-manifest.json

diff --git a/api/README.md b/api/README.md
index 75bdd61486f..4e4d06fa6a8 100644
--- a/api/README.md
+++ b/api/README.md
@@ -41,8 +41,8 @@ services:
 
 The application can also be installed manually, although this variant has only undergone limited testing. Prerequisites are a working installation of PHP 8 and [composer](https://getcomposer.org/):
 
-- Copy the content of this repository to your target server. Only the `./api/public` directory should be publicly accessible. 
-- Install the required dependencies by performing `composer install` inside the `./api/` directory. 
+- Copy the content of this repository to your target server. Only the `./api/public` directory should be publicly accessible.
+- Install the required dependencies by performing `composer install` inside the `./api/` directory.
 - Copy `./api/config_sample.txt_` into a file `./api/config.php` and adapt to your needs.
 - Access the api via the `api/public/index.php` file.
 
@@ -81,25 +81,25 @@ The response is again a JSON document, with the following fields:
 - an int field `questionseed` indicating the seed used for this response
 - an int array `questionvariants` containing all variant seeds of the question
 - an array of arrays `iframes` of arguments to create iframes to hold JS panels e.g. JSXGraph, GeoGebra
-- a boolean field `isinteractive`, indicating if the question contains elements preventing a static representation. If true, a printed version of the question would make no sense
-- a string field `questionnote`, containing the rendered questionnote of the question
-- an object field `aboutapi`, containing version metadata for the API and bundled Maxima instance
-
-The `aboutapi` object contains:
-
-- `stackmaxima`: The configured STACK Maxima version.
-- `stackapi`: The configured API version identifier.
-
-The input configuration consists of the following fields:
+- a boolean field `isinteractive`, indicating if the question contains elements preventing a static representation. If true, a printed version of the question would make no sense
+- a string field `questionnote`, containing the rendered questionnote of the question
+- an object field `aboutapi`, containing version metadata for the API and bundled Maxima instance
+
+The `aboutapi` object contains:
+
+- `stackmaxima`: The configured STACK Maxima version.
+- `stackapi`: The configured API version identifier.
+
+The input configuration consists of the following fields:
 
 - `validationtype`: A number indicating the configured validation type of the input. Possible values are 0 (hidden), 1 (with variable list), 2 (without variable list) and 3 (compact)
-- `samplesolution`: A map from strings to strings, containing the model answer of the input, in its input form. Input types which are rendered as only one input field, contain only an empty string as key, which is mapped to the model answer. More complex input types contain multiple entries, corresponding to different sub inputs, e.g. for matrix entries, or checkboxes. 
+- `samplesolution`: A map from strings to strings, containing the model answer of the input, in its input form. Input types which are rendered as only one input field, contain only an empty string as key, which is mapped to the model answer. More complex input types contain multiple entries, corresponding to different sub inputs, e.g. for matrix entries, or checkboxes.
 - `samplesolutionrender`: The rendered model answer, as latex code.
 - `configuration`: A map of configuration options. See below.
 
 #### Input Configuration Keys
 
-The following keys can be contained inside the input configuration options. The availability depends on the type of the input. Please consult the STACK documentation to check which options are supported by which types, if availability is not explicitly specified below:   
+The following keys can be contained inside the input configuration options. The availability depends on the type of the input. Please consult the STACK documentation to check which options are supported by which types, if availability is not explicitly specified below:
 
 - `type`: Indicates the type of the input, e.g. `algebraic`. Present for all inputs. Possible values are: `algebraic`, `boolean`, `checkbox`, `dropdown`, `equiv`, `matrix`, `notes`, `numerical`, `radio`, `singlechar`, `string`, `textarea`, `units` and `varmatrix`.
 - `boxWidth`: Specifies the desired box size of the input.
@@ -132,7 +132,7 @@ The grading route returns the following fields:
 - a map from the PRT names to floats `scoreweights`, containing the weighting for each part. `scoreweights['total']` contains the default total mark for the question. The mark for a question part is its `score[prt] * scoreweights[prt] * scoreweights['total']`.
 - a string field `specificfeedback` containing the rendered specific feedback text
 - a map from the PRT names to strings `prts`, containing the rendered PRT feedback
-- a map from the PRT names to objects `prtresults`, containing structured PRT grading data. Each entry includes `score`, `penalty`, `answernotes` (the full answer-note path as an array), `prtanswernotes` (the PRT-node answer notes only), `errors`, and `fverrors`.
+- a map from the PRT names to objects `prtresults`, containing structured PRT grading data. Each entry includes `score`, `penalty`, `answernotes` (the full answer-note path as an array), `prtanswernotes` (the PRT-node answer notes only), `errors`, and `fverrors`.
 - a string map `gradingassets`, containing a list of assets used in the grading response, see [Plots/Assets](#plotsassets)
 - a string field `responsesummary` containing a summary of response. (See [Reporting](../doc/en/Authoring/../STACK_question_admin/Reporting.md).)
 - an array of arrays `iframes` of arguments to create iframes to hold JS panels e.g. JSXGraph, GeoGebra
@@ -153,7 +153,7 @@ The validation route returns a string field `Validation` with the corresponding
 The `POST /download` route is used to download files created by questions.
 
 - `questionDefinition`: The Moodle-XML-Export of a single STACK question.
-- `seed`: Seed to choose a question variant. Must be contained in the list of deployed variants. If  
+- `seed`: Seed to choose a question variant. Must be contained in the list of deployed variants. If
   no seed is provided, the first deployed variant is used.
 - `filename` - as specified in the question definition and included in the question render.
 - `fileid` - as specified by the question render.
@@ -182,13 +182,13 @@ In the `results` object, each seed will key an object:
 - int|null: `passes`: Number of tests passed.
 - int|null: `fails`: Number of tests failed.
 - string: `messages`: Seed level error message. Includes summaries from the test, runtime errors and general feedback errors.
-- object: `outcomes`: Gives detailed breakdown of test result. Entries keyed by `<testcase>`. 
+- object: `outcomes`: Gives detailed breakdown of test result. Entries keyed by `<testcase>`.
 
 In the outcomes object, each test will key an object:
 - boolean: `passed`: Did the test pass?
 - string: `reason`: Reason for failure. A test empty message or the part of the output (e.g. score) which doesn't match the expected result.
 - object: `inputs`: Keyed by input name. Details of the inputs and their values.
-- object: `outcomes`: Keyed by PRT name. Details of the outcomes and expected outcomes for each PRT. Each PRT outcome includes the legacy delimiter-separated `answernote` string, plus structured `answernotes` and `prtanswernotes` arrays.
+- object: `outcomes`: Keyed by PRT name. Details of the outcomes and expected outcomes for each PRT. Each PRT outcome includes the legacy delimiter-separated `answernote` string, plus structured `answernotes` and `prtanswernotes` arrays.
 
 Example result object:
 ```
@@ -216,8 +216,8 @@ Example result object:
                     "score": 1,
                     "penalty": 0,
                     "answernote": "prt1-1-T",
-                    "answernotes": ["prt1-1-T"],
-                    "prtanswernotes": ["prt1-1-T"],
+                    "answernotes": ["prt1-1-T"],
+                    "prtanswernotes": ["prt1-1-T"],
                     "expectedscore": 1,
                     "expectedpenalty": 0,
                     "expectedanswernote": "prt1-1-T",
@@ -273,7 +273,7 @@ prt:
 **Under development** - Defaults, how they're handled and YAML layout may change.
 
 The API accepts questions is a Moodle XML format i.e. `<quiz><question type="stack"></question></quiz>`. Missing fields will be filled
-in from the `questiondefaults.yml` file. If there are no inputs or PRTs, a single one of each will be created. There will be no tests by default.  
+in from the `questiondefaults.yml` file. If there are no inputs or PRTs, a single one of each will be created. There will be no tests by default.
 - Input: `name: ans1, type: algebraic,
   tans: ta1`
 - PRT: `name: prt1`
@@ -281,12 +281,12 @@ in from the `questiondefaults.yml` file. If there are no inputs or PRTs, a singl
 
 If the API does not find XML in the required format it will attempt to interpret the file as YAML, again filling in blanks from the default
 file as with the XML. Fields are slightly different than from XML - rather than some fields having `text` and `format` children, there are
-`field` and `fieldformat` fields e.g.  
+`field` and `fieldformat` fields e.g.
 ```
 <specificfeedback>
   <text><p>[[feedback:prt1]]</p></text>
   <format>html</format>
-</specificfeedback>`  
+</specificfeedback>`
 ```
 becomes
 ```
@@ -338,7 +338,7 @@ If using summary format in the default file, do so like this:
 The API returns rendered CASText as parts of its responses in multiple places. The CASText is output as a single string in an intermediate format, which cannot be directly fed to browsers for display, and requires further processing. Applications using the API have to handle the following cases:
 
 - **Latex**: The rendered CASText can contain Latex code, which must be rendered before being displayed to the user, e.g. by MathJax. Latex blocks are always enclosed by either `\[ <latex> \]` for display mode latex, or `\( <latex> \)` for inline mode.
-- **Substitution Tokens**: The rendered CASText can contain substitution tokens, indicating where inputs, input validations or PRT feedback should be inserted. These tokens have the format `[[type:name]]`, where type can be either `feedback`, `input` or `validation`, and name corresponds to the input or PRT name. It is up to the embedding application to replace these tokens with the appropriate content, depending on the context. 
+- **Substitution Tokens**: The rendered CASText can contain substitution tokens, indicating where inputs, input validations or PRT feedback should be inserted. These tokens have the format `[[type:name]]`, where type can be either `feedback`, `input` or `validation`, and name corresponds to the input or PRT name. It is up to the embedding application to replace these tokens with the appropriate content, depending on the context.
 - **Images**: The rendered CASText can contain image tags, which have to be processed as described below: [Plots/Assets](#plotsassets)
 
 
@@ -383,7 +383,7 @@ Code dependencies of the api implementation are managed using composer. At runti
 
 ### Docker based development setup
 
-To ease the development process, the Dockerfile contained in the repository contains multiple stages for development, profiling and production deployment. To start developing using a docker container, start the docker-compose stack defined in the file [docker-compose.dev.yml](/api/docker/docker-compose.dev.yml). E.g. 
+To ease the development process, the Dockerfile contained in the repository contains multiple stages for development, profiling and production deployment. To start developing using a docker container, start the docker-compose stack defined in the file [docker-compose.dev.yml](/api/docker/docker-compose.dev.yml). E.g.
 
     docker compose -f docker-compose.dev.yml build
     docker compose -f docker-compose.dev.yml up
@@ -435,6 +435,45 @@ A basic frontend is provided at `http://localhost:3080/stack.php`. This should a
 
 `http://localhost:3080/bulktest.php` provides a front end for selecting a folder of STACK question files and running their included tests, similar to the STACK bulk test functionality in Moodle.
 
+### Private API demo
+
+The private API demo in `api/private-demo` is a demonstration of serving questions without exposing their Moodle XML to the browser. The browser sends either a `questionId` from a generated manifest, or a `questionPath` relative to the configured question library. These values are resolved to the local XML on the server side and then forwarded as STACK API requests to a private API container. The intermediate server also proxies generated plot/static assets back to the browser.
+
+The production-style compose file exposes only the frontend container on port 80:
+
+    cd api/docker
+    docker compose -f docker-compose.demo-private.yml build
+    docker compose -f docker-compose.demo-private.yml up
+
+After startup the demo is available at `http://localhost/`. The API container is reachable only inside the Docker network; the frontend container calls it using `STACK_PRIVATE_DEMO_API_URL`, which defaults to `http://api`.
+
+The question library location is configured with the `STACK_PRIVATE_DEMO_LIBRARY` environment variable. It defaults to `stacklibrary`, meaning `samplequestions/stacklibrary`. Set it to another directory name under `samplequestions` in the compose file, for example `stackdemo`, to serve `samplequestions/stackdemo` instead. After changing this value, rebuild `question-manifest.json` so the public catalogue and opaque question ids match the selected library.
+
+Pages:
+
+`notes.php` - An example of a course notes web page with embedded STACK questions.
+
+`index.php` - Allows a search of the library and display of any question.
+
+For local development, use the development compose file:
+
+    cd api/docker
+    docker compose -f docker-compose.demo-private.dev.yml build
+    docker compose -f docker-compose.demo-private.dev.yml up
+
+The development stack exposes the frontend at `http://localhost:3081/`, bind-mounts the relevant source folders, and rebuilds `api/private-demo/public/assets/question-manifest.json` on startup if it is missing. To rebuild the manifest manually after changing the configured STACK question library, run:
+
+    php api/private-demo/build_manifest.php
+
+The demo exposes these frontend routes:
+
+- `GET /demo/questions`: returns the public question catalogue. Each entry includes `questionId`, `name`, `filename`, and `category`; the XML path is not included.
+- `GET /embed?questionId=<id>`: renders a single embeddable question frame using a manifest id.
+- `GET /embed?questionPath=<path>`: renders a single embeddable question frame using a question-library-relative XML path.
+- `POST /demo/render`, `POST /demo/validate`, `POST /demo/grade`, `POST /demo/download`, and `POST /demo/diff`: proxy the corresponding STACK API route. Requests must include exactly one of `questionId` or `questionPath`; `questionDefinition` is rejected by the demo frontend.
+- `GET /demo/plot.php/<filename>`: proxies generated plots and static question assets from the private API container.
+- `GET /cors.php?name=<asset>` and `GET /demo/cors.php?name=<asset>`: serve CORS helper assets needed by iframe content.
+
 ### Modifications of existing STACK code
 
 The implementation of the standalone api required some modifications to existing STACK code, which could cause issues with future upstream patches. All performed modifications are documented in this section.
diff --git a/api/docker/DockerfileFrontendDemo b/api/docker/DockerfilePrivateDemo
similarity index 91%
rename from api/docker/DockerfileFrontendDemo
rename to api/docker/DockerfilePrivateDemo
index 2d8735b596e..dcf2474575d 100644
--- a/api/docker/DockerfileFrontendDemo
+++ b/api/docker/DockerfilePrivateDemo
@@ -8,6 +8,7 @@ RUN a2enmod rewrite
 
 ENV APACHE_DOCUMENT_ROOT=/srv/stack/api/private-demo/public
 ENV STACK_PRIVATE_DEMO_API_URL=http://api
+ENV STACK_PRIVATE_DEMO_LIBRARY=stacklibrary
 
 RUN sed -ri -e 's!/var/www/html!${APACHE_DOCUMENT_ROOT}!g' /etc/apache2/sites-available/*.conf
 RUN sed -ri -e 's!/var/www/!${APACHE_DOCUMENT_ROOT}!g' /etc/apache2/apache2.conf /etc/apache2/conf-available/*.conf
@@ -19,5 +20,4 @@ RUN mkdir -p /srv/stack/api/private-demo/public/assets && \
     cp /srv/stack/api/public/api.css /srv/stack/api/private-demo/public/assets/api.css && \
     cp /srv/stack/api/public/stackjsvle.js /srv/stack/api/private-demo/public/assets/stackjsvle.js && \
     cp /srv/stack/api/public/stackshared.js /srv/stack/api/private-demo/public/assets/stackshared.js && \
-    cp /srv/stack/api/public/logo_large.png /srv/stack/api/private-demo/public/assets/logo_large.png && \
-    test -f /srv/stack/api/private-demo/question-manifest.json
+    cp /srv/stack/api/public/logo_large.png /srv/stack/api/private-demo/public/assets/logo_large.png
diff --git a/api/docker/docker-compose.demo-private-library.dev.yml b/api/docker/docker-compose.demo-private.dev.yml
similarity index 79%
rename from api/docker/docker-compose.demo-private-library.dev.yml
rename to api/docker/docker-compose.demo-private.dev.yml
index aa392b66370..77a96a6f970 100644
--- a/api/docker/docker-compose.demo-private-library.dev.yml
+++ b/api/docker/docker-compose.demo-private.dev.yml
@@ -1,7 +1,7 @@
 # Development version of the private STACK API demo.
 #
 # Only the frontend is exposed to the host. Source is bind-mounted so PHP,
-# JavaScript, CSS, stacklibrary, and API changes are visible without rebuilding.
+# JavaScript, CSS, samplequestions, and API changes are visible without rebuilding.
 services:
   maxima:
     image: mathinstitut/goemaxima:2026062900-latest
@@ -38,13 +38,18 @@ services:
     restart: unless-stopped
     environment:
       STACK_PRIVATE_DEMO_API_URL: http://api
+      STACK_PRIVATE_DEMO_LIBRARY: stacklibrary
+    command: >
+      sh -c "test -f /srv/stack/api/private-demo/assets/question-manifest.json ||
+      php /srv/stack/api/private-demo/build_manifest.php;
+      apache2-foreground"
     volumes:
       - ../../api/private-demo:/srv/stack/api/private-demo
       - ../../api/public/api.css:/srv/stack/api/private-demo/public/assets/api.css:ro
       - ../../api/public/stackjsvle.js:/srv/stack/api/private-demo/public/assets/stackjsvle.js:ro
       - ../../api/public/stackshared.js:/srv/stack/api/private-demo/public/assets/stackshared.js:ro
       - ../../api/public/logo_large.png:/srv/stack/api/private-demo/public/assets/logo_large.png:ro
-      - ../../samplequestions/stacklibrary:/srv/stack/samplequestions/stacklibrary:ro
+      - ../../samplequestions:/srv/stack/samplequestions:ro
       - ../../corsscripts:/srv/stack/corsscripts:ro
     ports:
       - "3081:80"
diff --git a/api/docker/docker-compose.demo-private-library.yml b/api/docker/docker-compose.demo-private.yml
similarity index 94%
rename from api/docker/docker-compose.demo-private-library.yml
rename to api/docker/docker-compose.demo-private.yml
index 1dec80f70d3..e302171827b 100644
--- a/api/docker/docker-compose.demo-private-library.yml
+++ b/api/docker/docker-compose.demo-private.yml
@@ -33,6 +33,7 @@ services:
     restart: unless-stopped
     environment:
       STACK_PRIVATE_DEMO_API_URL: http://api
+      STACK_PRIVATE_DEMO_LIBRARY: stacklibrary
     ports:
       - "80:80"
     depends_on:
diff --git a/api/private-demo/assets/.gitignore b/api/private-demo/assets/.gitignore
new file mode 100644
index 00000000000..d6b7ef32c84
--- /dev/null
+++ b/api/private-demo/assets/.gitignore
@@ -0,0 +1,2 @@
+*
+!.gitignore
diff --git a/api/private-demo/build_manifest.php b/api/private-demo/build_manifest.php
index 7fb6694ae8b..56602c8c133 100644
--- a/api/private-demo/build_manifest.php
+++ b/api/private-demo/build_manifest.php
@@ -10,7 +10,7 @@
  * Build the private demo question manifest.
  *
  * The browser receives opaque question ids from this manifest. Only the
- * frontend container maps those ids back to stacklibrary XML files.
+ * frontend container maps those ids back to question-library XML files.
  *
  * @package    qtype_stack
  * @copyright  2026 University of Edinburgh
@@ -22,11 +22,14 @@
     die();
 }
 
-$root = realpath(__DIR__ . '/../../samplequestions/stacklibrary');
-$output = getenv('STACK_PRIVATE_DEMO_MANIFEST') ?: __DIR__ . '/question-manifest.json';
+require_once(__DIR__ . '/lib.php');
 
-if ($root === false) {
-    fwrite(STDERR, "Could not find stacklibrary.\n");
+$root = STACK_PRIVATE_DEMO_LIBRARY_ROOT;
+$output = __DIR__ . '/assets/question-manifest.json';
+$libraryroot = 'samplequestions/' . getenv('STACK_PRIVATE_DEMO_LIBRARY');
+
+if ($root === false || !is_dir($root)) {
+    fwrite(STDERR, "Could not find $libraryroot.\n");
     exit(1);
 }
 
@@ -117,7 +120,7 @@
 }
 
 $manifest = [
-    'root' => 'samplequestions/stacklibrary',
+    'root' => $libraryroot,
     'questions' => $questions,
 ];
 
diff --git a/api/private-demo/lib.php b/api/private-demo/lib.php
index 7a0d65e264d..9e95611a8e0 100644
--- a/api/private-demo/lib.php
+++ b/api/private-demo/lib.php
@@ -15,9 +15,13 @@
  */
 
 define('STACK_PRIVATE_DEMO_ROOT', realpath(__DIR__ . '/../..'));
-define('STACK_PRIVATE_DEMO_LIBRARY_ROOT', realpath(STACK_PRIVATE_DEMO_ROOT . '/samplequestions/stacklibrary'));
+define('STACK_PRIVATE_DEMO_SAMPLEQUESTIONS_ROOT', realpath(STACK_PRIVATE_DEMO_ROOT . '/samplequestions'));
+define(
+    'STACK_PRIVATE_DEMO_LIBRARY_ROOT',
+    realpath(STACK_PRIVATE_DEMO_ROOT . '/samplequestions/' . trim(getenv('STACK_PRIVATE_DEMO_LIBRARY') ?: 'stacklibrary', '/'))
+);
 define('STACK_PRIVATE_DEMO_CORS_ROOT', realpath(STACK_PRIVATE_DEMO_ROOT . '/corsscripts'));
-define('STACK_PRIVATE_DEMO_MANIFEST', getenv('STACK_PRIVATE_DEMO_MANIFEST') ?: __DIR__ . '/question-manifest.json');
+define('STACK_PRIVATE_DEMO_MANIFEST', __DIR__ . '/assets/question-manifest.json');
 define('STACK_PRIVATE_DEMO_API_BASE', rtrim(getenv('STACK_PRIVATE_DEMO_API_URL') ?: 'http://api', '/'));
 
 /**
@@ -117,9 +121,9 @@ function stack_private_demo_question_definition($questionid) {
 }
 
 /**
- * Resolve a stacklibrary-relative path to a local XML question definition.
+ * Resolve a question-library-relative path to a local XML question definition.
  *
- * @param string $relativepath Relative path under samplequestions/stacklibrary.
+ * @param string $relativepath Relative path under the configured question library.
  * @param bool $manifestpath Whether the path came from the generated manifest.
  * @return string XML question definition.
  */
diff --git a/api/private-demo/public/notes.php b/api/private-demo/public/notes.php
index 00409d0afb6..71efb6f4169 100644
--- a/api/private-demo/public/notes.php
+++ b/api/private-demo/public/notes.php
@@ -76,7 +76,7 @@
       <section class="notes-section">
         <h2>Embedded By File Location</h2>
         <p>
-          This embedded question is selected by a stacklibrary-relative file location:
+          This embedded question is selected by a configured question-library-relative file location:
           <code><?=htmlspecialchars($pathquestion)?></code>.
         </p>
         <iframe
diff --git a/api/private-demo/question-manifest.json b/api/private-demo/question-manifest.json
deleted file mode 100644
index 555931ae9c5..00000000000
--- a/api/private-demo/question-manifest.json
+++ /dev/null
@@ -1,17848 +0,0 @@
-{
-    "root": "samplequestions/stacklibrary",
-    "questions": {
-        "q_e3e6491ff2b4ee12": {
-            "id": "q_e3e6491ff2b4ee12",
-            "name": "AlgMap-1.1",
-            "filename": "AlgMap-1-1.xml",
-            "path": "Algebra-Refresher/01-Combinations-of-arithmetic-operations/AlgMap-1-1.xml",
-            "category": "Algebra-Refresher/01-Combinations-of-arithmetic-operations"
-        },
-        "q_ae2a68e432c6de1b": {
-            "id": "q_ae2a68e432c6de1b",
-            "name": "AlgMap-1.2",
-            "filename": "AlgMap-1-2.xml",
-            "path": "Algebra-Refresher/01-Combinations-of-arithmetic-operations/AlgMap-1-2.xml",
-            "category": "Algebra-Refresher/01-Combinations-of-arithmetic-operations"
-        },
-        "q_9dcf0864c35efd81": {
-            "id": "q_9dcf0864c35efd81",
-            "name": "AlgMap-1.3",
-            "filename": "AlgMap-1-3.xml",
-            "path": "Algebra-Refresher/01-Combinations-of-arithmetic-operations/AlgMap-1-3.xml",
-            "category": "Algebra-Refresher/01-Combinations-of-arithmetic-operations"
-        },
-        "q_e3cdde438286c639": {
-            "id": "q_e3cdde438286c639",
-            "name": "AlgMap-1.4",
-            "filename": "AlgMap-1-4.xml",
-            "path": "Algebra-Refresher/01-Combinations-of-arithmetic-operations/AlgMap-1-4.xml",
-            "category": "Algebra-Refresher/01-Combinations-of-arithmetic-operations"
-        },
-        "q_ba5e6f00eb5a0d28": {
-            "id": "q_ba5e6f00eb5a0d28",
-            "name": "AlgMap-1.5",
-            "filename": "AlgMap-1-5.xml",
-            "path": "Algebra-Refresher/01-Combinations-of-arithmetic-operations/AlgMap-1-5.xml",
-            "category": "Algebra-Refresher/01-Combinations-of-arithmetic-operations"
-        },
-        "q_aa88d858459e8ec8": {
-            "id": "q_aa88d858459e8ec8",
-            "name": "AlgMap-1.6",
-            "filename": "AlgMap-1-6.xml",
-            "path": "Algebra-Refresher/01-Combinations-of-arithmetic-operations/AlgMap-1-6.xml",
-            "category": "Algebra-Refresher/01-Combinations-of-arithmetic-operations"
-        },
-        "q_5088286228155553": {
-            "id": "q_5088286228155553",
-            "name": "AlgMap-1.7",
-            "filename": "AlgMap-1-7.xml",
-            "path": "Algebra-Refresher/01-Combinations-of-arithmetic-operations/AlgMap-1-7.xml",
-            "category": "Algebra-Refresher/01-Combinations-of-arithmetic-operations"
-        },
-        "q_b6e34a6c7fb022a3": {
-            "id": "q_b6e34a6c7fb022a3",
-            "name": "AlgMap-2.1",
-            "filename": "AlgMap-2-1.xml",
-            "path": "Algebra-Refresher/02-Factorisation-of-whole-numbers/AlgMap-2-1.xml",
-            "category": "Algebra-Refresher/02-Factorisation-of-whole-numbers"
-        },
-        "q_ec6c57ec5e030e0c": {
-            "id": "q_ec6c57ec5e030e0c",
-            "name": "AlgMap-2.2",
-            "filename": "AlgMap-2-2.xml",
-            "path": "Algebra-Refresher/02-Factorisation-of-whole-numbers/AlgMap-2-2.xml",
-            "category": "Algebra-Refresher/02-Factorisation-of-whole-numbers"
-        },
-        "q_05bd51abdad5f8a9": {
-            "id": "q_05bd51abdad5f8a9",
-            "name": "AlgMap-2.3",
-            "filename": "AlgMap-2-3.xml",
-            "path": "Algebra-Refresher/02-Factorisation-of-whole-numbers/AlgMap-2-3.xml",
-            "category": "Algebra-Refresher/02-Factorisation-of-whole-numbers"
-        },
-        "q_8150cd0e470eb124": {
-            "id": "q_8150cd0e470eb124",
-            "name": "AlgMap-2.4",
-            "filename": "AlgMap-2-4.xml",
-            "path": "Algebra-Refresher/02-Factorisation-of-whole-numbers/AlgMap-2-4.xml",
-            "category": "Algebra-Refresher/02-Factorisation-of-whole-numbers"
-        },
-        "q_1e62eb22e36c0357": {
-            "id": "q_1e62eb22e36c0357",
-            "name": "AlgMap-2.5",
-            "filename": "AlgMap-2-5.xml",
-            "path": "Algebra-Refresher/02-Factorisation-of-whole-numbers/AlgMap-2-5.xml",
-            "category": "Algebra-Refresher/02-Factorisation-of-whole-numbers"
-        },
-        "q_796265b109bf87c2": {
-            "id": "q_796265b109bf87c2",
-            "name": "AlgMap-2.6",
-            "filename": "AlgMap-2-6.xml",
-            "path": "Algebra-Refresher/02-Factorisation-of-whole-numbers/AlgMap-2-6.xml",
-            "category": "Algebra-Refresher/02-Factorisation-of-whole-numbers"
-        },
-        "q_76a796ae37e8ab83": {
-            "id": "q_76a796ae37e8ab83",
-            "name": "AlgMap-2.7",
-            "filename": "AlgMap-2-7.xml",
-            "path": "Algebra-Refresher/02-Factorisation-of-whole-numbers/AlgMap-2-7.xml",
-            "category": "Algebra-Refresher/02-Factorisation-of-whole-numbers"
-        },
-        "q_b2b38e52e8a915c2": {
-            "id": "q_b2b38e52e8a915c2",
-            "name": "AlgMap-3.1",
-            "filename": "AlgMap-3-1.xml",
-            "path": "Algebra-Refresher/03-Addition-and-subtraction-of-fractions/AlgMap-3-1.xml",
-            "category": "Algebra-Refresher/03-Addition-and-subtraction-of-fractions"
-        },
-        "q_ecd84a563a7c3eda": {
-            "id": "q_ecd84a563a7c3eda",
-            "name": "AlgMap-3.2",
-            "filename": "AlgMap-3-2.xml",
-            "path": "Algebra-Refresher/03-Addition-and-subtraction-of-fractions/AlgMap-3-2.xml",
-            "category": "Algebra-Refresher/03-Addition-and-subtraction-of-fractions"
-        },
-        "q_c33b131048fc9a00": {
-            "id": "q_c33b131048fc9a00",
-            "name": "AlgMap-3.3",
-            "filename": "AlgMap-3-3.xml",
-            "path": "Algebra-Refresher/03-Addition-and-subtraction-of-fractions/AlgMap-3-3.xml",
-            "category": "Algebra-Refresher/03-Addition-and-subtraction-of-fractions"
-        },
-        "q_506ddb5337c93c16": {
-            "id": "q_506ddb5337c93c16",
-            "name": "AlgMap-3.4",
-            "filename": "AlgMap-3-4.xml",
-            "path": "Algebra-Refresher/03-Addition-and-subtraction-of-fractions/AlgMap-3-4.xml",
-            "category": "Algebra-Refresher/03-Addition-and-subtraction-of-fractions"
-        },
-        "q_ce63edd0b758c353": {
-            "id": "q_ce63edd0b758c353",
-            "name": "AlgMap-3.5",
-            "filename": "AlgMap-3-5.xml",
-            "path": "Algebra-Refresher/03-Addition-and-subtraction-of-fractions/AlgMap-3-5.xml",
-            "category": "Algebra-Refresher/03-Addition-and-subtraction-of-fractions"
-        },
-        "q_b081f6bdb048c71f": {
-            "id": "q_b081f6bdb048c71f",
-            "name": "AlgMap-3.6",
-            "filename": "AlgMap-3-6.xml",
-            "path": "Algebra-Refresher/03-Addition-and-subtraction-of-fractions/AlgMap-3-6.xml",
-            "category": "Algebra-Refresher/03-Addition-and-subtraction-of-fractions"
-        },
-        "q_037334ab79ac20b4": {
-            "id": "q_037334ab79ac20b4",
-            "name": "AlgMap-3.7",
-            "filename": "AlgMap-3-7.xml",
-            "path": "Algebra-Refresher/03-Addition-and-subtraction-of-fractions/AlgMap-3-7.xml",
-            "category": "Algebra-Refresher/03-Addition-and-subtraction-of-fractions"
-        },
-        "q_c00bfdbf2a2aa005": {
-            "id": "q_c00bfdbf2a2aa005",
-            "name": "AlgMap-3.8",
-            "filename": "AlgMap-3-8.xml",
-            "path": "Algebra-Refresher/03-Addition-and-subtraction-of-fractions/AlgMap-3-8.xml",
-            "category": "Algebra-Refresher/03-Addition-and-subtraction-of-fractions"
-        },
-        "q_2fa1336ea052ed34": {
-            "id": "q_2fa1336ea052ed34",
-            "name": "AlgMap-3.9",
-            "filename": "AlgMap-3-9.xml",
-            "path": "Algebra-Refresher/03-Addition-and-subtraction-of-fractions/AlgMap-3-9.xml",
-            "category": "Algebra-Refresher/03-Addition-and-subtraction-of-fractions"
-        },
-        "q_4b494a1b3c4d2762": {
-            "id": "q_4b494a1b3c4d2762",
-            "name": "AlgMap-4.1",
-            "filename": "AlgMap-4-1.xml",
-            "path": "Algebra-Refresher/04-Multiplication-and-division-of-fractions/AlgMap-4-1.xml",
-            "category": "Algebra-Refresher/04-Multiplication-and-division-of-fractions"
-        },
-        "q_db8aa9bebf33f87f": {
-            "id": "q_db8aa9bebf33f87f",
-            "name": "AlgMap-4.13",
-            "filename": "AlgMap-4-13.xml",
-            "path": "Algebra-Refresher/04-Multiplication-and-division-of-fractions/AlgMap-4-13.xml",
-            "category": "Algebra-Refresher/04-Multiplication-and-division-of-fractions"
-        },
-        "q_3714e7a3a657f3ff": {
-            "id": "q_3714e7a3a657f3ff",
-            "name": "AlgMap-4.2",
-            "filename": "AlgMap-4-2.xml",
-            "path": "Algebra-Refresher/04-Multiplication-and-division-of-fractions/AlgMap-4-2.xml",
-            "category": "Algebra-Refresher/04-Multiplication-and-division-of-fractions"
-        },
-        "q_c9dcf4f8832e5558": {
-            "id": "q_c9dcf4f8832e5558",
-            "name": "AlgMap-4.3",
-            "filename": "AlgMap-4-3.xml",
-            "path": "Algebra-Refresher/04-Multiplication-and-division-of-fractions/AlgMap-4-3.xml",
-            "category": "Algebra-Refresher/04-Multiplication-and-division-of-fractions"
-        },
-        "q_5dc27724abd312d9": {
-            "id": "q_5dc27724abd312d9",
-            "name": "AlgMap-4.4",
-            "filename": "AlgMap-4-4.xml",
-            "path": "Algebra-Refresher/04-Multiplication-and-division-of-fractions/AlgMap-4-4.xml",
-            "category": "Algebra-Refresher/04-Multiplication-and-division-of-fractions"
-        },
-        "q_9c1f8a015918be3b": {
-            "id": "q_9c1f8a015918be3b",
-            "name": "AlgMap-4.5",
-            "filename": "AlgMap-4-5.xml",
-            "path": "Algebra-Refresher/04-Multiplication-and-division-of-fractions/AlgMap-4-5.xml",
-            "category": "Algebra-Refresher/04-Multiplication-and-division-of-fractions"
-        },
-        "q_8edfc3d25d96bbda": {
-            "id": "q_8edfc3d25d96bbda",
-            "name": "AlgMap-5.1",
-            "filename": "AlgMap-5-1.xml",
-            "path": "Algebra-Refresher/05-Combinations-of-arithmetic-operations-on-fractions/AlgMap-5-1.xml",
-            "category": "Algebra-Refresher/05-Combinations-of-arithmetic-operations-on-fractions"
-        },
-        "q_3366ad48e96bb9ed": {
-            "id": "q_3366ad48e96bb9ed",
-            "name": "AlgMap-5.2",
-            "filename": "AlgMap-5-2.xml",
-            "path": "Algebra-Refresher/05-Combinations-of-arithmetic-operations-on-fractions/AlgMap-5-2.xml",
-            "category": "Algebra-Refresher/05-Combinations-of-arithmetic-operations-on-fractions"
-        },
-        "q_0f5dd2f7369ed6c1": {
-            "id": "q_0f5dd2f7369ed6c1",
-            "name": "AlgMap-6.1",
-            "filename": "AlgMap-6-1.xml",
-            "path": "Algebra-Refresher/06-Simplifying-algebraic-expressions/AlgMap-6-1.xml",
-            "category": "Algebra-Refresher/06-Simplifying-algebraic-expressions"
-        },
-        "q_6af0d296a76cf736": {
-            "id": "q_6af0d296a76cf736",
-            "name": "AlgMap-6.2",
-            "filename": "AlgMap-6-2.xml",
-            "path": "Algebra-Refresher/06-Simplifying-algebraic-expressions/AlgMap-6-2.xml",
-            "category": "Algebra-Refresher/06-Simplifying-algebraic-expressions"
-        },
-        "q_b76d2a13100ba57c": {
-            "id": "q_b76d2a13100ba57c",
-            "name": "AlgMap-6.4",
-            "filename": "AlgMap-6-4.xml",
-            "path": "Algebra-Refresher/06-Simplifying-algebraic-expressions/AlgMap-6-4.xml",
-            "category": "Algebra-Refresher/06-Simplifying-algebraic-expressions"
-        },
-        "q_60886be05f3c170e": {
-            "id": "q_60886be05f3c170e",
-            "name": "AlgMap-6.5",
-            "filename": "AlgMap-6-5.xml",
-            "path": "Algebra-Refresher/06-Simplifying-algebraic-expressions/AlgMap-6-5.xml",
-            "category": "Algebra-Refresher/06-Simplifying-algebraic-expressions"
-        },
-        "q_856ef86451219630": {
-            "id": "q_856ef86451219630",
-            "name": "AlgMap-6.6",
-            "filename": "AlgMap-6-6.xml",
-            "path": "Algebra-Refresher/06-Simplifying-algebraic-expressions/AlgMap-6-6.xml",
-            "category": "Algebra-Refresher/06-Simplifying-algebraic-expressions"
-        },
-        "q_4480e78d4479d7e8": {
-            "id": "q_4480e78d4479d7e8",
-            "name": "AlgMap-6.7",
-            "filename": "AlgMap-6-7.xml",
-            "path": "Algebra-Refresher/06-Simplifying-algebraic-expressions/AlgMap-6-7.xml",
-            "category": "Algebra-Refresher/06-Simplifying-algebraic-expressions"
-        },
-        "q_c4600f1ba205d879": {
-            "id": "q_c4600f1ba205d879",
-            "name": "AlgMap-6.8",
-            "filename": "AlgMap-6-8.xml",
-            "path": "Algebra-Refresher/06-Simplifying-algebraic-expressions/AlgMap-6-8.xml",
-            "category": "Algebra-Refresher/06-Simplifying-algebraic-expressions"
-        },
-        "q_56897280003c3759": {
-            "id": "q_56897280003c3759",
-            "name": "AlgMap-7.1",
-            "filename": "AlgMap-7-1.xml",
-            "path": "Algebra-Refresher/07-Removing-brackets/AlgMap-7-1.xml",
-            "category": "Algebra-Refresher/07-Removing-brackets"
-        },
-        "q_7558ab089dc41350": {
-            "id": "q_7558ab089dc41350",
-            "name": "AlgMap-7.10",
-            "filename": "AlgMap-7-10.xml",
-            "path": "Algebra-Refresher/07-Removing-brackets/AlgMap-7-10.xml",
-            "category": "Algebra-Refresher/07-Removing-brackets"
-        },
-        "q_fca5ed9f46d4429c": {
-            "id": "q_fca5ed9f46d4429c",
-            "name": "AlgMap-7.2",
-            "filename": "AlgMap-7-2.xml",
-            "path": "Algebra-Refresher/07-Removing-brackets/AlgMap-7-2.xml",
-            "category": "Algebra-Refresher/07-Removing-brackets"
-        },
-        "q_643b08d257ade48f": {
-            "id": "q_643b08d257ade48f",
-            "name": "AlgMap-7.3",
-            "filename": "AlgMap-7-3.xml",
-            "path": "Algebra-Refresher/07-Removing-brackets/AlgMap-7-3.xml",
-            "category": "Algebra-Refresher/07-Removing-brackets"
-        },
-        "q_b2c1200a2b101552": {
-            "id": "q_b2c1200a2b101552",
-            "name": "AlgMap-7.4",
-            "filename": "AlgMap-7-4.xml",
-            "path": "Algebra-Refresher/07-Removing-brackets/AlgMap-7-4.xml",
-            "category": "Algebra-Refresher/07-Removing-brackets"
-        },
-        "q_2a5ab7e9bf14116f": {
-            "id": "q_2a5ab7e9bf14116f",
-            "name": "AlgMap-7.5",
-            "filename": "AlgMap-7-5.xml",
-            "path": "Algebra-Refresher/07-Removing-brackets/AlgMap-7-5.xml",
-            "category": "Algebra-Refresher/07-Removing-brackets"
-        },
-        "q_f262c1ec0cfa3ad1": {
-            "id": "q_f262c1ec0cfa3ad1",
-            "name": "AlgMap-7.6",
-            "filename": "AlgMap-7-6.xml",
-            "path": "Algebra-Refresher/07-Removing-brackets/AlgMap-7-6.xml",
-            "category": "Algebra-Refresher/07-Removing-brackets"
-        },
-        "q_a77ffde74cb654fb": {
-            "id": "q_a77ffde74cb654fb",
-            "name": "AlgMap-7.7",
-            "filename": "AlgMap-7-7.xml",
-            "path": "Algebra-Refresher/07-Removing-brackets/AlgMap-7-7.xml",
-            "category": "Algebra-Refresher/07-Removing-brackets"
-        },
-        "q_3c6b15c17db32fd3": {
-            "id": "q_3c6b15c17db32fd3",
-            "name": "AlgMap-7.8",
-            "filename": "AlgMap-7-8.xml",
-            "path": "Algebra-Refresher/07-Removing-brackets/AlgMap-7-8.xml",
-            "category": "Algebra-Refresher/07-Removing-brackets"
-        },
-        "q_cf0df24be4963553": {
-            "id": "q_cf0df24be4963553",
-            "name": "AlgMap-7.9",
-            "filename": "AlgMap-7-9.xml",
-            "path": "Algebra-Refresher/07-Removing-brackets/AlgMap-7-9.xml",
-            "category": "Algebra-Refresher/07-Removing-brackets"
-        },
-        "q_b9c9ea78c570d952": {
-            "id": "q_b9c9ea78c570d952",
-            "name": "AlgMap-8.1",
-            "filename": "AlgMap-8-1.xml",
-            "path": "Algebra-Refresher/08-Algebraic-fractions/AlgMap-8-1.xml",
-            "category": "Algebra-Refresher/08-Algebraic-fractions"
-        },
-        "q_6840ab2e368985e8": {
-            "id": "q_6840ab2e368985e8",
-            "name": "AlgMap-8.10",
-            "filename": "AlgMap-8-10.xml",
-            "path": "Algebra-Refresher/08-Algebraic-fractions/AlgMap-8-10.xml",
-            "category": "Algebra-Refresher/08-Algebraic-fractions"
-        },
-        "q_1c3f64d3fd74cc2b": {
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-            "path": "Topics/LinearAlgebra/Vector-Spaces/Make-set-of-vectors-a-basis-for-hyperplane-in-R4.xml",
-            "category": "Topics/LinearAlgebra/Vector-Spaces"
-        },
-        "q_65536e75041e75c2": {
-            "id": "q_65536e75041e75c2",
-            "name": "Matrices_Rank_1",
-            "filename": "Matrices_Rank_1.xml",
-            "path": "Topics/LinearAlgebra/Vector-Spaces/Matrices_Rank_1.xml",
-            "category": "Topics/LinearAlgebra/Vector-Spaces"
-        },
-        "q_164040aa3cd25917": {
-            "id": "q_164040aa3cd25917",
-            "name": "Planes_find_equation_plane",
-            "filename": "Planes_find_equation_plane.xml",
-            "path": "Topics/LinearAlgebra/Vector-Spaces/Planes_find_equation_plane.xml",
-            "category": "Topics/LinearAlgebra/Vector-Spaces"
-        },
-        "q_e417de1a9cccddad": {
-            "id": "q_e417de1a9cccddad",
-            "name": "Subspace_Dimension_1",
-            "filename": "Subspace_Dimension_1.xml",
-            "path": "Topics/LinearAlgebra/Vector-Spaces/Subspace_Dimension_1.xml",
-            "category": "Topics/LinearAlgebra/Vector-Spaces"
-        },
-        "q_b1bf5c3c44fc2f47": {
-            "id": "q_b1bf5c3c44fc2f47",
-            "name": "Vector_1",
-            "filename": "Vector_1.xml",
-            "path": "Topics/LinearAlgebra/Vector-Spaces/Vector_1.xml",
-            "category": "Topics/LinearAlgebra/Vector-Spaces"
-        },
-        "q_107c1c02fd2abf2f": {
-            "id": "q_107c1c02fd2abf2f",
-            "name": "Vector_2",
-            "filename": "Vector_2.xml",
-            "path": "Topics/LinearAlgebra/Vector-Spaces/Vector_2.xml",
-            "category": "Topics/LinearAlgebra/Vector-Spaces"
-        },
-        "q_bfeabb94ec1cc2d0": {
-            "id": "q_bfeabb94ec1cc2d0",
-            "name": "Vector_3",
-            "filename": "Vector_3.xml",
-            "path": "Topics/LinearAlgebra/Vector-Spaces/Vector_3.xml",
-            "category": "Topics/LinearAlgebra/Vector-Spaces"
-        },
-        "q_95d70b824890ebf0": {
-            "id": "q_95d70b824890ebf0",
-            "name": "Vector_Basis_1",
-            "filename": "Vector_Basis_1.xml",
-            "path": "Topics/LinearAlgebra/Vector-Spaces/Vector_Basis_1.xml",
-            "category": "Topics/LinearAlgebra/Vector-Spaces"
-        },
-        "q_634ef3cd16223398": {
-            "id": "q_634ef3cd16223398",
-            "name": "Vector_Basis_2",
-            "filename": "Vector_Basis_2.xml",
-            "path": "Topics/LinearAlgebra/Vector-Spaces/Vector_Basis_2.xml",
-            "category": "Topics/LinearAlgebra/Vector-Spaces"
-        },
-        "q_c10a3919f99dfe4b": {
-            "id": "q_c10a3919f99dfe4b",
-            "name": "Vector_Cross_Product",
-            "filename": "Vector_Cross_Product.xml",
-            "path": "Topics/LinearAlgebra/Vector-Spaces/Vector_Cross_Product.xml",
-            "category": "Topics/LinearAlgebra/Vector-Spaces"
-        },
-        "q_27d5f2222ec0709b": {
-            "id": "q_27d5f2222ec0709b",
-            "name": "Vector_Dependent_1",
-            "filename": "Vector_Dependent_1.xml",
-            "path": "Topics/LinearAlgebra/Vector-Spaces/Vector_Dependent_1.xml",
-            "category": "Topics/LinearAlgebra/Vector-Spaces"
-        },
-        "q_69a9178f890f4eb7": {
-            "id": "q_69a9178f890f4eb7",
-            "name": "Vector_Dot_Product",
-            "filename": "Vector_Dot_Product.xml",
-            "path": "Topics/LinearAlgebra/Vector-Spaces/Vector_Dot_Product.xml",
-            "category": "Topics/LinearAlgebra/Vector-Spaces"
-        },
-        "q_390636f3aec97340": {
-            "id": "q_390636f3aec97340",
-            "name": "Vector_Independent_1",
-            "filename": "Vector_Independent_1.xml",
-            "path": "Topics/LinearAlgebra/Vector-Spaces/Vector_Independent_1.xml",
-            "category": "Topics/LinearAlgebra/Vector-Spaces"
-        },
-        "q_dca6cbc57e198659": {
-            "id": "q_dca6cbc57e198659",
-            "name": "Vectors_add columns",
-            "filename": "Vectors_add-columns.xml",
-            "path": "Topics/LinearAlgebra/Vector-Spaces/Vectors_add-columns.xml",
-            "category": "Topics/LinearAlgebra/Vector-Spaces"
-        },
-        "q_ac3855831ff39607": {
-            "id": "q_ac3855831ff39607",
-            "name": "Logs_1",
-            "filename": "Logs_1.xml",
-            "path": "Topics/Logs-and-Exponentials/Logs_1.xml",
-            "category": "Topics/Logs-and-Exponentials"
-        },
-        "q_119e585df2023d06": {
-            "id": "q_119e585df2023d06",
-            "name": "Logs_2",
-            "filename": "Logs_2.xml",
-            "path": "Topics/Logs-and-Exponentials/Logs_2.xml",
-            "category": "Topics/Logs-and-Exponentials"
-        },
-        "q_f83b3cac88c913b7": {
-            "id": "q_f83b3cac88c913b7",
-            "name": "W6 Q6 PC (Infinitely many primes)",
-            "filename": "Proof_comprehension_infinite_primes.xml",
-            "path": "Topics/Proof/Proof_comprehension_infinite_primes.xml",
-            "category": "Topics/Proof"
-        },
-        "q_2410c37375ff275d": {
-            "id": "q_2410c37375ff275d",
-            "name": "W5 Q9 PC (Roots of unity)",
-            "filename": "Proof_comprehension_roots_unity.xml",
-            "path": "Topics/Proof/Proof_comprehension_roots_unity.xml",
-            "category": "Topics/Proof"
-        },
-        "q_6cb4165667b63ef5": {
-            "id": "q_6cb4165667b63ef5",
-            "name": "Q02 Q8 Proof by induction (general) sum (2k-1)^3  = n^2(2n^2-1)",
-            "filename": "Proof_gaps_induction_series.xml",
-            "path": "Topics/Proof/Proof_gaps_induction_series.xml",
-            "category": "Topics/Proof"
-        },
-        "q_2880ef1c44f8c28a": {
-            "id": "q_2880ef1c44f8c28a",
-            "name": "Series_1",
-            "filename": "Series_1.xml",
-            "path": "Topics/Series/Maclaurin-Series/Series_1.xml",
-            "category": "Topics/Series/Maclaurin-Series"
-        },
-        "q_b7fd1bc43f6d75d5": {
-            "id": "q_b7fd1bc43f6d75d5",
-            "name": "Series_2",
-            "filename": "Series_2.xml",
-            "path": "Topics/Series/Maclaurin-Series/Series_2.xml",
-            "category": "Topics/Series/Maclaurin-Series"
-        },
-        "q_bab6e4e0f78133f5": {
-            "id": "q_bab6e4e0f78133f5",
-            "name": "Series_3",
-            "filename": "Series_3.xml",
-            "path": "Topics/Series/Maclaurin-Series/Series_3.xml",
-            "category": "Topics/Series/Maclaurin-Series"
-        },
-        "q_6b88b850a09a81be": {
-            "id": "q_6b88b850a09a81be",
-            "name": "Cartesian_Set_1",
-            "filename": "Cartesian_Set_1.xml",
-            "path": "Topics/Sets/Cartesian_Set_1.xml",
-            "category": "Topics/Sets"
-        },
-        "q_e31e48ebf1928b7b": {
-            "id": "q_e31e48ebf1928b7b",
-            "name": "Set_1",
-            "filename": "Set_1.xml",
-            "path": "Topics/Sets/Set_1.xml",
-            "category": "Topics/Sets"
-        },
-        "q_d5bff4b46a09e8b0": {
-            "id": "q_d5bff4b46a09e8b0",
-            "name": "Set_Intersection_1",
-            "filename": "Set_Intersection_1.xml",
-            "path": "Topics/Sets/Set_Intersection_1.xml",
-            "category": "Topics/Sets"
-        },
-        "q_af65621ee0bd2fa1": {
-            "id": "q_af65621ee0bd2fa1",
-            "name": "Set_Intersection_2",
-            "filename": "Set_Intersection_2.xml",
-            "path": "Topics/Sets/Set_Intersection_2.xml",
-            "category": "Topics/Sets"
-        },
-        "q_e5b85113b60a758d": {
-            "id": "q_e5b85113b60a758d",
-            "name": "Set_Interval_1",
-            "filename": "Set_Interval_1.xml",
-            "path": "Topics/Sets/Set_Interval_1.xml",
-            "category": "Topics/Sets"
-        },
-        "q_47fb86c25a91817f": {
-            "id": "q_47fb86c25a91817f",
-            "name": "Set_Interval_2",
-            "filename": "Set_Interval_2.xml",
-            "path": "Topics/Sets/Set_Interval_2.xml",
-            "category": "Topics/Sets"
-        },
-        "q_957bea88086e7502": {
-            "id": "q_957bea88086e7502",
-            "name": "Subset_1",
-            "filename": "Subset_1.xml",
-            "path": "Topics/Sets/Subset_1.xml",
-            "category": "Topics/Sets"
-        }
-    }
-}

From f472636451a51264f39e820122bd5610bc6ca172 Mon Sep 17 00:00:00 2001
From: Edmund Farrow <edmund.farrow@ed.ac.uk>
Date: Thu, 30 Jul 2026 15:06:00 +0100
Subject: [PATCH 03/10] api-frontend - Use Slim. Tidy.

---
 api/docker/DockerfilePrivateDemo              |  10 +
 .../docker-compose.demo-private.dev.yml       |   2 +-
 api/docker/docker-compose.demo-private.yml    |   2 +-
 api/private-demo/{public => }/embed.php       |  29 +-
 api/private-demo/home.php                     | 108 +++++
 api/private-demo/lib.php                      | 370 +++++++++++-------
 api/private-demo/public/index.php             | 173 +++-----
 7 files changed, 405 insertions(+), 289 deletions(-)
 rename api/private-demo/{public => }/embed.php (78%)
 create mode 100644 api/private-demo/home.php

diff --git a/api/docker/DockerfilePrivateDemo b/api/docker/DockerfilePrivateDemo
index dcf2474575d..6620b1684c0 100644
--- a/api/docker/DockerfilePrivateDemo
+++ b/api/docker/DockerfilePrivateDemo
@@ -2,6 +2,15 @@
 # It serves the browser UI and privately calls an API container over the
 # Docker network. It does not expose the STACK API routes directly.
 
+FROM composer:lts AS composer
+
+COPY / /work/
+
+WORKDIR /work/api/
+
+RUN composer install
+RUN composer dump-autoload --optimize
+
 FROM php:8.4.5-apache-bookworm
 
 RUN a2enmod rewrite
@@ -15,6 +24,7 @@ RUN sed -ri -e 's!/var/www/!${APACHE_DOCUMENT_ROOT}!g' /etc/apache2/apache2.conf
 
 COPY ./api/docker/files/private-demo/000-default.conf /etc/apache2/sites-available/000-default.conf
 COPY / /srv/stack
+COPY --from=composer /work/api/vendor /srv/stack/api/vendor
 
 RUN mkdir -p /srv/stack/api/private-demo/public/assets && \
     cp /srv/stack/api/public/api.css /srv/stack/api/private-demo/public/assets/api.css && \
diff --git a/api/docker/docker-compose.demo-private.dev.yml b/api/docker/docker-compose.demo-private.dev.yml
index 77a96a6f970..01bcef685c1 100644
--- a/api/docker/docker-compose.demo-private.dev.yml
+++ b/api/docker/docker-compose.demo-private.dev.yml
@@ -34,7 +34,7 @@ services:
   frontend:
     build:
       context: ./../../
-      dockerfile: ./api/docker/DockerfileFrontendDemo
+      dockerfile: ./api/docker/DockerfilePrivateDemo
     restart: unless-stopped
     environment:
       STACK_PRIVATE_DEMO_API_URL: http://api
diff --git a/api/docker/docker-compose.demo-private.yml b/api/docker/docker-compose.demo-private.yml
index e302171827b..dd32e5b0f18 100644
--- a/api/docker/docker-compose.demo-private.yml
+++ b/api/docker/docker-compose.demo-private.yml
@@ -29,7 +29,7 @@ services:
   frontend:
     build:
       context: ./../../
-      dockerfile: ./api/docker/DockerfileFrontendDemo
+      dockerfile: ./api/docker/DockerfilePrivateDemo
     restart: unless-stopped
     environment:
       STACK_PRIVATE_DEMO_API_URL: http://api
diff --git a/api/private-demo/public/embed.php b/api/private-demo/embed.php
similarity index 78%
rename from api/private-demo/public/embed.php
rename to api/private-demo/embed.php
index 0fb9eed2233..9bed1afd7e9 100644
--- a/api/private-demo/public/embed.php
+++ b/api/private-demo/embed.php
@@ -14,24 +14,10 @@
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later.
  */
 
-require_once(__DIR__ . '/../lib.php');
+require_once(__DIR__ . '/lib.php');
 
-$questionid = isset($_GET['questionId']) ? trim($_GET['questionId']) : '';
-$questionpath = isset($_GET['questionPath']) ? trim($_GET['questionPath']) : '';
-
-if (($questionid === '' && $questionpath === '') || ($questionid !== '' && $questionpath !== '')) {
-    http_response_code(400);
-    echo 'Exactly one of questionId or questionPath is required.';
-    die();
-}
-if ($questionid !== '') {
-    // Fail early for malformed embed URLs. The API request will still perform
-    // the authoritative manifest lookup.
-    $xml = stack_private_demo_question_definition($questionid);
-}
-if ($questionpath !== '') {
-    $xml = stack_private_demo_question_definition_from_path($questionpath);
-}
+$reference = stack_private_demo_question_reference($queryparams ?? []);
+$xml = stack_private_demo_question_definition_from_reference($reference);
 
 $title = 'Practice question';
 libxml_use_internal_errors(true);
@@ -44,14 +30,7 @@
     }
 }
 
-$question = [
-    'name' => $title,
-];
-if ($questionid !== '') {
-    $question['questionId'] = $questionid;
-} else {
-    $question['questionPath'] = $questionpath;
-}
+$question = array_merge(['name' => $title], $reference);
 ?>
 <!doctype html>
 <html>
diff --git a/api/private-demo/home.php b/api/private-demo/home.php
new file mode 100644
index 00000000000..d28e6c880c1
--- /dev/null
+++ b/api/private-demo/home.php
@@ -0,0 +1,108 @@
+<?php
+// This file is part of Stack - http://stack.maths.ed.ac.uk/
+//
+// Stack is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+/**
+ * Private STACK API demo homepage.
+ *
+ * @package    qtype_stack
+ * @copyright  2026 University of Edinburgh
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later.
+ */
+?>
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8"/>
+    <title>STACK Private API Demo</title>
+    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
+    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" />
+    <link rel="stylesheet" href="assets/api.css" />
+    <style>
+      .question-browser {
+        max-width: 48rem;
+        margin-bottom: 1rem;
+      }
+      .question-browser input,
+      .question-browser select {
+        width: 100%;
+      }
+      .question-browser select {
+        min-height: 16rem;
+      }
+      .question-meta {
+        color: #555;
+        font-size: 0.875rem;
+        margin-top: 0.35rem;
+      }
+      .private-demo-content {
+        margin-left: 0;
+        padding: 1px 16px;
+      }
+      .question-frame {
+        border: 0;
+        min-height: 46rem;
+        width: 100%;
+      }
+    </style>
+    <script src="private-demo.js"></script>
+  </head>
+  <body>
+    <div class="container-fluid que stack">
+      <div>
+        <a href="https://stack-assessment.org/" class="nav-link">
+          <span style="display: flex; align-items: center; font-size: 20px">
+            <span style="display: flex; align-items: center;">
+              <img src="assets/logo_large.png" style="height: 50px;" alt="STACK">
+              <span style="font-size: 50px;"><b>STACK</b></span>
+            </span>
+            &nbsp;| Online assessment
+          </span>
+        </a>
+      </div>
+      <h2>Private API Demonstration</h2>
+      <div class="col-lg-9">
+        <p>
+          This demo serves questions from the STACK library without sending question XML to the browser.
+        </p>
+        <hr>
+      </div>
+      <div id="errors"></div>
+      <div class="question-browser col-lg-9">
+        <input
+          id="question-search"
+          class="form-control"
+          type="search"
+          placeholder="Search by question name or filename"
+          autocomplete="off"
+        />
+        <select id="question-list" class="form-control" size="12"></select>
+        <div id="question-count" class="question-meta"></div>
+      </div>
+      <div>
+        <div class="main-content private-demo-content">
+          <br>
+          <div class="col-lg-10">
+            <iframe
+              id="question-frame"
+              class="question-frame"
+              title="Selected STACK question"
+            ></iframe>
+          </div>
+          <div class="col-lg-9">
+            <hr />
+            <p style="font-size: 0.875em;color:gray;">
+              The STACK source code, including this API, is licensed under the GNU General Public, License Version 3.
+              Documentation, sample questions and materials, are licensed under
+              Creative Commons Attribution-ShareAlike 4.0 International.
+            </p>
+          </div>
+        </div>
+      </div>
+    </div>
+  </body>
+</html>
diff --git a/api/private-demo/lib.php b/api/private-demo/lib.php
index 9e95611a8e0..0bd6d117f4f 100644
--- a/api/private-demo/lib.php
+++ b/api/private-demo/lib.php
@@ -15,7 +15,6 @@
  */
 
 define('STACK_PRIVATE_DEMO_ROOT', realpath(__DIR__ . '/../..'));
-define('STACK_PRIVATE_DEMO_SAMPLEQUESTIONS_ROOT', realpath(STACK_PRIVATE_DEMO_ROOT . '/samplequestions'));
 define(
     'STACK_PRIVATE_DEMO_LIBRARY_ROOT',
     realpath(STACK_PRIVATE_DEMO_ROOT . '/samplequestions/' . trim(getenv('STACK_PRIVATE_DEMO_LIBRARY') ?: 'stacklibrary', '/'))
@@ -25,26 +24,100 @@
 define('STACK_PRIVATE_DEMO_API_BASE', rtrim(getenv('STACK_PRIVATE_DEMO_API_URL') ?: 'http://api', '/'));
 
 /**
- * Send a JSON response and stop execution.
+ * HTTP error for the private demo frontend.
+ */
+class stack_private_demo_http_exception extends RuntimeException {
+    /**
+     * Get the HTTP status.
+     *
+     * @return int HTTP status.
+     */
+    public function get_status() {
+        return $this->getCode() ?: 500;
+    }
+}
+
+/**
+ * Raise an HTTP error.
  *
+ * @param string $message Error message.
+ * @param int $status HTTP status.
+ * @throws stack_private_demo_http_exception
+ */
+function stack_private_demo_error($message, $status = 400) {
+    throw new stack_private_demo_http_exception($message, $status);
+}
+
+/**
+ * Write a JSON response.
+ *
+ * @param object $response Response.
  * @param mixed $data Response data.
  * @param int $status HTTP status.
+ * @return object Response.
  */
-function stack_private_demo_json($data, $status = 200) {
-    http_response_code($status);
-    header('Content-Type: application/json;charset=UTF-8');
-    echo json_encode($data, JSON_UNESCAPED_SLASHES);
-    die();
+function stack_private_demo_json_response($response, $data, $status = 200) {
+    $json = json_encode($data, JSON_UNESCAPED_SLASHES);
+    if ($json === false) {
+        stack_private_demo_error('Could not encode JSON response.', 500);
+    }
+
+    $response->getBody()->write($json);
+    return $response
+        ->withStatus($status)
+        ->withHeader('Content-Type', 'application/json;charset=UTF-8');
 }
 
 /**
- * Send an error JSON response and stop execution.
+ * Write a text response.
  *
- * @param string $message Error message.
+ * @param object $response Response.
+ * @param string $text Response text.
  * @param int $status HTTP status.
+ * @return object Response.
  */
-function stack_private_demo_error($message, $status = 400) {
-    stack_private_demo_json(['message' => $message], $status);
+function stack_private_demo_text_response($response, $text, $status = 200) {
+    $response->getBody()->write($text);
+    return $response
+        ->withStatus($status)
+        ->withHeader('Content-Type', 'text/plain;charset=UTF-8');
+}
+
+/**
+ * Render a local PHP template into a response.
+ *
+ * @param object $response Response.
+ * @param string $template Template path.
+ * @param array $data Template data.
+ * @return object Response.
+ */
+function stack_private_demo_template_response($response, $template, $data = []) {
+    extract($data, EXTR_SKIP);
+
+    ob_start();
+    require($template);
+    $response->getBody()->write(ob_get_clean());
+    return $response->withHeader('Content-Type', 'text/html;charset=UTF-8');
+}
+
+/**
+ * Resolve a relative path beneath a configured root directory.
+ *
+ * @param string|false $root Root directory.
+ * @param string $relativepath Relative path.
+ * @return string|false Resolved file path, or false if unavailable.
+ */
+function stack_private_demo_resolve_file($root, $relativepath) {
+    if (!is_string($root) || $root === '' || !is_dir($root) || !is_string($relativepath) || $relativepath === '') {
+        return false;
+    }
+
+    $fullpath = realpath($root . DIRECTORY_SEPARATOR . $relativepath);
+    if ($fullpath === false || !str_starts_with($fullpath, $root . DIRECTORY_SEPARATOR) || !is_file($fullpath)) {
+        return false;
+    }
+
+    return $fullpath;
 }
 
 /**
@@ -87,17 +160,16 @@ function stack_private_demo_catalogue() {
 }
 
 /**
- * Decode the current JSON request body.
+ * Decode a JSON request body.
  *
+ * @param object $request Request.
  * @return array Request data.
  */
-function stack_private_demo_request_json() {
-    $raw = file_get_contents('php://input');
-    $data = json_decode($raw, true);
+function stack_private_demo_request_json($request) {
+    $data = json_decode((string) $request->getBody(), true);
     if (!is_array($data)) {
         stack_private_demo_error('Expected a JSON object.');
     }
-
     if (array_key_exists('questionDefinition', $data)) {
         stack_private_demo_error('questionDefinition is not accepted by this demo.');
     }
@@ -105,6 +177,31 @@ function stack_private_demo_request_json() {
     return $data;
 }
 
+/**
+ * Get exactly one question reference from request data.
+ *
+ * @param array $data Request data.
+ * @return array Question reference.
+ */
+function stack_private_demo_question_reference($data) {
+    $questionid = $data['questionId'] ?? null;
+    $questionid = is_string($questionid) ? trim($questionid) : null;
+    $questionid = $questionid === '' ? null : $questionid;
+
+    $questionpath = $data['questionPath'] ?? null;
+    $questionpath = is_string($questionpath) ? trim($questionpath) : null;
+    $questionpath = $questionpath === '' ? null : $questionpath;
+
+    if (($questionid === null && $questionpath === null) || ($questionid !== null && $questionpath !== null)) {
+        stack_private_demo_error('Exactly one of questionId or questionPath is required.');
+    }
+
+    if ($questionid !== null) {
+        return ['questionId' => $questionid];
+    }
+    return ['questionPath' => $questionpath];
+}
+
 /**
  * Resolve a question id to a local XML question definition.
  *
@@ -120,6 +217,18 @@ function stack_private_demo_question_definition($questionid) {
     return stack_private_demo_question_definition_from_path($manifest['questions'][$questionid]['path'], true);
 }
 
+/**
+ * Resolve a question reference to a local XML question definition.
+ *
+ * @param array $reference Question reference.
+ * @return string XML question definition.
+ */
+function stack_private_demo_question_definition_from_reference($reference) {
+    return isset($reference['questionId']) ?
+        stack_private_demo_question_definition($reference['questionId']) :
+        stack_private_demo_question_definition_from_path($reference['questionPath']);
+}
+
 /**
  * Resolve a question-library-relative path to a local XML question definition.
  *
@@ -132,14 +241,13 @@ function stack_private_demo_question_definition_from_path($relativepath, $manife
         !is_string($relativepath) ||
         $relativepath === '' ||
         str_starts_with($relativepath, '/') ||
-        str_contains($relativepath, '..') ||
         strtolower(pathinfo($relativepath, PATHINFO_EXTENSION)) !== 'xml'
     ) {
         stack_private_demo_error($manifestpath ? 'Invalid question path in manifest.' : 'Invalid question path.', 400);
     }
 
-    $fullpath = realpath(STACK_PRIVATE_DEMO_LIBRARY_ROOT . '/' . $relativepath);
-    if ($fullpath === false || !str_starts_with($fullpath, STACK_PRIVATE_DEMO_LIBRARY_ROOT . DIRECTORY_SEPARATOR)) {
+    $fullpath = stack_private_demo_resolve_file(STACK_PRIVATE_DEMO_LIBRARY_ROOT, $relativepath);
+    if ($fullpath === false) {
         stack_private_demo_error('Question file is not available.', $manifestpath ? 500 : 404);
     }
 
@@ -159,18 +267,11 @@ function stack_private_demo_question_definition_from_path($relativepath, $manife
  * @return array API request.
  */
 function stack_private_demo_api_payload($data, $route) {
-    $questionid = $data['questionId'] ?? null;
-    $questionpath = $data['questionPath'] ?? null;
-    if (($questionid === null && $questionpath === null) || ($questionid !== null && $questionpath !== null)) {
-        stack_private_demo_error('Exactly one of questionId or questionPath is required.');
-    }
-
+    $reference = stack_private_demo_question_reference($data);
     $payload = $data;
     unset($payload['questionId']);
     unset($payload['questionPath']);
-    $payload['questionDefinition'] = $questionid !== null ?
-        stack_private_demo_question_definition($questionid) :
-        stack_private_demo_question_definition_from_path($questionpath);
+    $payload['questionDefinition'] = stack_private_demo_question_definition_from_reference($reference);
 
     if ($route === 'render') {
         unset($payload['answers']);
@@ -179,136 +280,137 @@ function stack_private_demo_api_payload($data, $route) {
     return $payload;
 }
 
+/**
+ * Proxy a private STACK API container response.
+ *
+ * @param object $response Response.
+ * @param string $url API URL.
+ * @param array $options HTTP stream options.
+ * @param string $defaulttype Default content type.
+ * @param string $errormessage Message to show if the request fails.
+ * @param bool $forwardlength Whether to forward the content length header.
+ * @return object Response.
+ */
+function stack_private_demo_proxy_api($response, $url, $options, $defaulttype, $errormessage, $forwardlength = false) {
+    $context = stream_context_create(['http' => $options + [
+        'ignore_errors' => true,
+        'timeout' => 60,
+    ]]);
+    $body = file_get_contents($url, false, $context);
+    if ($body === false) {
+        stack_private_demo_error($errormessage, 502);
+    }
+
+    $status = 200;
+    $contenttype = $defaulttype;
+    $length = '';
+    foreach ($http_response_header ?? [] as $header) {
+        if (preg_match('/^HTTP\/\S+\s+([0-9]{3})\s/', $header, $matches)) {
+            $status = (int) $matches[1];
+            continue;
+        }
+        if (stripos($header, 'Content-Type:') === 0) {
+            $contenttype = trim(substr($header, strlen('Content-Type:')));
+            continue;
+        }
+        if (stripos($header, 'Content-Length:') === 0) {
+            $length = trim(substr($header, strlen('Content-Length:')));
+        }
+    }
+
+    $response = $response
+        ->withStatus($status)
+        ->withHeader('Content-Type', $contenttype);
+
+    if ($forwardlength && $length !== '') {
+        $response = $response->withHeader('Content-Length', $length);
+    }
+
+    $response->getBody()->write($body);
+    return $response;
+}
+
 /**
  * Proxy a JSON POST to the private STACK API container.
  *
+ * @param object $request Request.
+ * @param object $response Response.
  * @param string $route API route.
  * @param array $payload API payload.
+ * @return object Response.
  */
-function stack_private_demo_proxy_json($route, $payload) {
+function stack_private_demo_proxy_json($request, $response, $route, $payload) {
     $json = json_encode($payload, JSON_UNESCAPED_SLASHES);
     if ($json === false) {
         stack_private_demo_error('Could not encode API request.', 500);
     }
 
-    $headers = [
-        'Content-Type: application/json',
-    ];
-    $language = $_SERVER['HTTP_ACCEPT_LANGUAGE'] ?? '';
+    $headers = ['Content-Type: application/json'];
+    $language = $request->getHeaderLine('Accept-Language');
     if ($language !== '') {
         $headers[] = 'Accept-Language: ' . $language;
     }
 
-    $context = stream_context_create([
-        'http' => [
+    return stack_private_demo_proxy_api(
+        $response,
+        STACK_PRIVATE_DEMO_API_BASE . '/' . $route,
+        [
             'method' => 'POST',
             'header' => implode("\r\n", $headers),
             'content' => $json,
-            'ignore_errors' => true,
-            'timeout' => 60,
         ],
-    ]);
-
-    $url = STACK_PRIVATE_DEMO_API_BASE . '/' . $route;
-    $body = file_get_contents($url, false, $context);
-    if ($body === false) {
-        stack_private_demo_error('Private API request failed.', 502);
-    }
-
-    $status = stack_private_demo_response_status($http_response_header ?? []);
-    http_response_code($status);
-    header('Content-Type: ' . stack_private_demo_header_value($http_response_header ?? [], 'Content-Type', 'application/json'));
-    echo $body;
-    die();
+        'application/json',
+        'Private API request failed.'
+    );
 }
 
 /**
  * Proxy a generated plot/static question asset from the private API container.
  *
+ * @param object $response Response.
  * @param string $filename Asset filename.
+ * @return object Response.
  */
-function stack_private_demo_proxy_plot($filename) {
+function stack_private_demo_proxy_plot($response, $filename) {
     $filename = basename(urldecode($filename));
     if ($filename === '' || $filename === '.' || $filename === '..') {
         stack_private_demo_error('Invalid asset name.');
     }
 
-    $context = stream_context_create([
-        'http' => [
-            'method' => 'GET',
-            'ignore_errors' => true,
-            'timeout' => 60,
-        ],
-    ]);
-
-    $url = STACK_PRIVATE_DEMO_API_BASE . '/plot.php/' . rawurlencode($filename);
-    $body = file_get_contents($url, false, $context);
-    if ($body === false) {
-        stack_private_demo_error('Private API asset request failed.', 502);
-    }
-
-    $headers = $http_response_header ?? [];
-    http_response_code(stack_private_demo_response_status($headers));
-    header('Content-Type: ' . stack_private_demo_header_value($headers, 'Content-Type', 'application/octet-stream'));
-    $length = stack_private_demo_header_value($headers, 'Content-Length', '');
-    if ($length !== '') {
-        header('Content-Length: ' . $length);
-    }
-    echo $body;
-    die();
+    return stack_private_demo_proxy_api(
+        $response,
+        STACK_PRIVATE_DEMO_API_BASE . '/plot.php/' . rawurlencode($filename),
+        ['method' => 'GET'],
+        'application/octet-stream',
+        'Private API asset request failed.',
+        true
+    );
 }
 
 /**
  * Serve a static helper asset with CORS headers for iframe content.
  *
+ * @param object $request Request.
+ * @param object $response Response.
  * @param string $asset Relative asset path.
+ * @return object Response.
  */
-function stack_private_demo_cors_asset($asset) {
-    header('Access-Control-Allow-Origin: *');
-    header('Access-Control-Allow-Headers: *');
-
-    if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
-        header('HTTP/1.0 204 No Content');
-        header('Access-Control-Allow-Methods: GET, OPTIONS');
-        die();
-    }
-
-    if ($_SERVER['REQUEST_METHOD'] !== 'GET') {
-        stack_private_demo_error('Method not allowed.', 405);
-    }
-
-    $asset = ltrim(urldecode($asset), '/');
-    if ($asset === '' || str_contains($asset, '..') || str_starts_with($asset, '/')) {
-        http_response_code(404);
-        echo 'No such script here.';
-        die();
+function stack_private_demo_cors_asset($request, $response, $asset) {
+    $response = $response
+        ->withHeader('Access-Control-Allow-Origin', '*')
+        ->withHeader('Access-Control-Allow-Headers', '*');
+
+    if ($request->getMethod() === 'OPTIONS') {
+        return $response
+            ->withStatus(204)
+            ->withHeader('Access-Control-Allow-Methods', 'GET, OPTIONS');
     }
 
-    $fullpath = realpath(STACK_PRIVATE_DEMO_CORS_ROOT . '/' . $asset);
-    if (
-        $fullpath === false ||
-        !str_starts_with($fullpath, STACK_PRIVATE_DEMO_CORS_ROOT . DIRECTORY_SEPARATOR) ||
-        !is_file($fullpath)
-    ) {
-        http_response_code(404);
-        echo 'No such script here.';
-        die();
+    $fullpath = stack_private_demo_resolve_file(STACK_PRIVATE_DEMO_CORS_ROOT, ltrim(urldecode($asset), '/'));
+    if ($fullpath === false) {
+        return stack_private_demo_text_response($response, 'No such script here.', 404);
     }
 
-    header('Content-Type: ' . stack_private_demo_mimetype($fullpath));
-    header('Cache-Control: public, max-age=31104000, immutable');
-    readfile($fullpath);
-    die();
-}
-
-/**
- * Return a MIME type for a public static helper asset.
- *
- * @param string $path Asset path.
- * @return string MIME type.
- */
-function stack_private_demo_mimetype($path) {
-    $extension = strtolower(pathinfo($path, PATHINFO_EXTENSION));
     $types = [
         'css' => 'text/css;charset=UTF-8',
         'js' => 'text/javascript;charset=UTF-8',
@@ -316,35 +418,9 @@ function stack_private_demo_mimetype($path) {
         'json' => 'application/json;charset=UTF-8',
     ];
 
-    return $types[$extension] ?? 'application/octet-stream';
-}
-
-/**
- * Get the HTTP response status from wrapper response headers.
- *
- * @param array $headers Response headers.
- * @return int HTTP status.
- */
-function stack_private_demo_response_status($headers) {
-    if (!empty($headers[0]) && preg_match('/\s([0-9]{3})\s/', $headers[0], $matches)) {
-        return (int) $matches[1];
-    }
-    return 200;
-}
-
-/**
- * Get a response header value from wrapper response headers.
- *
- * @param array $headers Response headers.
- * @param string $name Header name.
- * @param string $default Default value.
- * @return string Header value.
- */
-function stack_private_demo_header_value($headers, $name, $default) {
-    foreach ($headers as $header) {
-        if (stripos($header, $name . ':') === 0) {
-            return trim(substr($header, strlen($name) + 1));
-        }
-    }
-    return $default;
+    $response->getBody()->write(file_get_contents($fullpath));
+    return $response
+        ->withHeader('Content-Type', $types[strtolower(pathinfo($fullpath, PATHINFO_EXTENSION))] ??
+            'application/octet-stream')
+        ->withHeader('Cache-Control', 'public, max-age=31104000, immutable');
 }
diff --git a/api/private-demo/public/index.php b/api/private-demo/public/index.php
index d7d9f918325..f715f71f5d7 100644
--- a/api/private-demo/public/index.php
+++ b/api/private-demo/public/index.php
@@ -15,131 +15,74 @@
  */
 
 require_once(__DIR__ . '/../lib.php');
+require_once(__DIR__ . '/../../vendor/autoload.php');
 
-$path = trim(parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH), '/');
-$method = $_SERVER['REQUEST_METHOD'];
+use Psr\Http\Message\ResponseInterface;
+use Slim\Factory\AppFactory;
 
-if ($path === 'demo/questions' && $method === 'GET') {
-    stack_private_demo_json(stack_private_demo_catalogue());
-}
+$app = AppFactory::create();
+$responsefactory = $app->getResponseFactory();
 
-if ($path === 'cors.php' || $path === 'demo/cors.php') {
-    stack_private_demo_cors_asset($_GET['name'] ?? '');
-}
+$app->add(function($request, $handler) use ($responsefactory) {
+    try {
+        return $handler->handle($request);
+    } catch (stack_private_demo_http_exception $exception) {
+        $response = $responsefactory->createResponse();
+        if (str_starts_with($request->getUri()->getPath(), '/demo/')) {
+            return stack_private_demo_json_response(
+                $response,
+                ['message' => $exception->getMessage()],
+                $exception->get_status()
+            );
+        }
+        return stack_private_demo_text_response($response, $exception->getMessage(), $exception->get_status());
+    }
+});
 
-if (preg_match('#^demo/plot\.php/(.+)$#', $path, $matches) && $method === 'GET') {
-    stack_private_demo_proxy_plot($matches[1]);
+$app->get('/demo/questions', function($request, ResponseInterface $response) {
+    return stack_private_demo_json_response($response, stack_private_demo_catalogue());
+});
+
+foreach (['/cors.php', '/demo/cors.php'] as $route) {
+    $app->map(['GET', 'OPTIONS'], $route, function($request, ResponseInterface $response) {
+        $params = $request->getQueryParams();
+        return stack_private_demo_cors_asset($request, $response, $params['name'] ?? '');
+    });
 }
 
-if (preg_match('#^demo/(render|validate|grade|download|diff)$#', $path, $matches) && $method === 'POST') {
-    $route = $matches[1];
-    $data = stack_private_demo_request_json();
+$app->get('/demo/plot.php/{filename:.+}', function($request, ResponseInterface $response, $args) {
+    return stack_private_demo_proxy_plot($response, $args['filename']);
+});
+
+$app->post('/demo/{route:render|validate|grade|download|diff}', function($request, ResponseInterface $response, $args) {
+    $route = $args['route'];
+    $data = stack_private_demo_request_json($request);
     $payload = stack_private_demo_api_payload($data, $route);
     if ($route === 'diff') {
         $payload = ['questionDefinition' => $payload['questionDefinition']];
     }
-    stack_private_demo_proxy_json($route, $payload);
-}
+    return stack_private_demo_proxy_json($request, $response, $route, $payload);
+});
 
-if ($path === 'embed' && $method === 'GET') {
-    require(__DIR__ . '/embed.php');
-    die();
-}
+$app->get('/embed', function($request, ResponseInterface $response) {
+    return stack_private_demo_template_response(
+        $response,
+        __DIR__ . '/../embed.php',
+        ['queryparams' => $request->getQueryParams()]
+    );
+});
 
-if ($path !== '' && $path !== 'index.php') {
-    http_response_code(404);
-    echo 'Not found';
-    die();
+foreach (['/', '/index.php'] as $route) {
+    $app->get($route, function($request, ResponseInterface $response) {
+        return stack_private_demo_template_response($response, __DIR__ . '/../home.php');
+    });
 }
-?>
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8"/>
-    <title>STACK Private API Demo</title>
-    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
-    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" />
-    <link rel="stylesheet" href="assets/api.css" />
-    <style>
-      .question-browser {
-        max-width: 48rem;
-        margin-bottom: 1rem;
-      }
-      .question-browser input,
-      .question-browser select {
-        width: 100%;
-      }
-      .question-browser select {
-        min-height: 16rem;
-      }
-      .question-meta {
-        color: #555;
-        font-size: 0.875rem;
-        margin-top: 0.35rem;
-      }
-      .private-demo-content {
-        margin-left: 0;
-        padding: 1px 16px;
-      }
-      .question-frame {
-        border: 0;
-        min-height: 46rem;
-        width: 100%;
-      }
-    </style>
-    <script src="private-demo.js"></script>
-  </head>
-  <body>
-    <div class="container-fluid que stack">
-      <div>
-        <a href="https://stack-assessment.org/" class="nav-link">
-          <span style="display: flex; align-items: center; font-size: 20px">
-            <span style="display: flex; align-items: center;">
-              <img src="assets/logo_large.png" style="height: 50px;" alt="STACK">
-              <span style="font-size: 50px;"><b>STACK</b></span>
-            </span>
-            &nbsp;| Online assessment
-          </span>
-        </a>
-      </div>
-      <h2>Private API Demonstration</h2>
-      <div class="col-lg-9">
-        <p>
-          This demo serves questions from the STACK library without sending question XML to the browser.
-        </p>
-        <hr>
-      </div>
-      <div id="errors"></div>
-      <div class="question-browser col-lg-9">
-        <input
-          id="question-search"
-          class="form-control"
-          type="search"
-          placeholder="Search by question name or filename"
-          autocomplete="off"
-        />
-        <select id="question-list" class="form-control" size="12"></select>
-        <div id="question-count" class="question-meta"></div>
-      </div>
-      <div>
-        <div class="main-content private-demo-content">
-          <br>
-          <div class="col-lg-10">
-            <iframe
-              id="question-frame"
-              class="question-frame"
-              title="Selected STACK question"
-            ></iframe>
-          </div>
-          <div class="col-lg-9">
-            <hr />
-            <p style="font-size: 0.875em;color:gray;">
-              The STACK source code, including this API, is licensed under the GNU General Public, License Version 3.
-              Documentation, sample questions and materials, are licensed under Creative Commons Attribution-ShareAlike 4.0 International.
-            </p>
-          </div>
-        </div>
-      </div>
-    </div>
-  </body>
-</html>
+
+$app->map(['GET', 'POST', 'PUT', 'PATCH', 'DELETE', 'OPTIONS'], '/{routes:.+}', function($request, ResponseInterface $response) {
+    if (str_starts_with($request->getUri()->getPath(), '/demo/')) {
+        return stack_private_demo_json_response($response, ['message' => 'Not found'], 404);
+    }
+    return stack_private_demo_text_response($response, 'Not found', 404);
+});
+
+$app->run();

From e0479872b0ce3c8a13e3758d9a5f3113f2d993db Mon Sep 17 00:00:00 2001
From: Edmund Farrow <edmund.farrow@ed.ac.uk>
Date: Fri, 31 Jul 2026 11:28:16 +0100
Subject: [PATCH 04/10] api-frontend - Embedded seed handling

---
 api/private-demo/build_manifest.php       |  1 -
 api/private-demo/embed.php                | 16 +++++++----
 api/private-demo/lib.php                  | 34 +++++++++++++++++++++++
 api/private-demo/public/embed-question.js | 22 ++++++++++++---
 api/private-demo/public/notes.php         |  6 ++--
 5 files changed, 66 insertions(+), 13 deletions(-)

diff --git a/api/private-demo/build_manifest.php b/api/private-demo/build_manifest.php
index 56602c8c133..ca3c1c324b2 100644
--- a/api/private-demo/build_manifest.php
+++ b/api/private-demo/build_manifest.php
@@ -116,7 +116,6 @@
     foreach ($errors as $error) {
         fwrite(STDERR, $error . "\n");
     }
-    exit(1);
 }
 
 $manifest = [
diff --git a/api/private-demo/embed.php b/api/private-demo/embed.php
index 9bed1afd7e9..40a76d8219a 100644
--- a/api/private-demo/embed.php
+++ b/api/private-demo/embed.php
@@ -18,11 +18,13 @@
 
 $reference = stack_private_demo_question_reference($queryparams ?? []);
 $xml = stack_private_demo_question_definition_from_reference($reference);
-
-$title = 'Practice question';
 libxml_use_internal_errors(true);
 $quiz = simplexml_load_string($xml);
 libxml_clear_errors();
+$seedsequence = stack_private_demo_embed_seed_sequence($queryparams ?? [], $quiz);
+
+$title = 'Practice question';
+
 if ($quiz !== false && isset($quiz->question[0]->name->text)) {
     $questionname = trim((string) $quiz->question[0]->name->text);
     if ($questionname !== '') {
@@ -31,6 +33,9 @@
 }
 
 $question = array_merge(['name' => $title], $reference);
+if ($seedsequence !== null) {
+    $question['seeds'] = $seedsequence;
+}
 ?>
 <!doctype html>
 <html>
@@ -50,9 +55,6 @@
         margin-left: 0;
         padding: 0;
       }
-      #stackapi_spinner {
-        display: none;
-      }
     </style>
     <script
       type="text/javascript"
@@ -64,10 +66,12 @@
         serverUrl: '/demo/',
         displayType: 'SAMPLE'
       };
-      window.stackEmbeddedQuestion = <?=json_encode($question, JSON_UNESCAPED_SLASHES)?>;
     </script>
     <script src="assets/stackshared.js"></script>
     <script src="embed-question.js"></script>
+    <script>
+      configureEmbeddedQuestion(<?=json_encode($question, JSON_UNESCAPED_SLASHES)?>);
+    </script>
   </head>
   <body>
     <div class="main-content que stack">
diff --git a/api/private-demo/lib.php b/api/private-demo/lib.php
index 0bd6d117f4f..7a9967ff09d 100644
--- a/api/private-demo/lib.php
+++ b/api/private-demo/lib.php
@@ -229,6 +229,40 @@ function stack_private_demo_question_definition_from_reference($reference) {
         stack_private_demo_question_definition_from_path($reference['questionPath']);
 }
 
+/**
+ * Get the seed sequence requested for an embedded question.
+ *
+ * @param array $data Query parameters.
+ * @param SimpleXMLElement $quiz Quiz XML.
+ * @return int[]|null Seed sequence, or null if no seed control was requested.
+ */
+function stack_private_demo_embed_seed_sequence($data, $quiz) {
+    if (empty($data['seeds']) || !is_string($data['seeds'])) {
+        return null;
+    }
+
+    $seeds = trim($data['seeds']);
+    if (strtolower($seeds) === 'all') {
+        return stack_private_demo_deployed_seeds_from_xml($quiz);
+    }
+
+    return array_map('intval', preg_split('/\s*,\s*/', $seeds, -1, PREG_SPLIT_NO_EMPTY));
+}
+
+/**
+ * Read deployed seeds from question XML.
+ *
+ * @param SimpleXMLElement $quiz .
+ * @return int[] Deployed seeds.
+ */
+function stack_private_demo_deployed_seeds_from_xml($quiz) {
+    $seeds = [];
+    foreach ($quiz->question[0]->deployedseed as $seed) {
+        $seeds[] = (int) $seed;
+    }
+    return $seeds;
+}
+
 /**
  * Resolve a question-library-relative path to a local XML question definition.
  *
diff --git a/api/private-demo/public/embed-question.js b/api/private-demo/public/embed-question.js
index 1cfc926c655..b3792d559bf 100644
--- a/api/private-demo/public/embed-question.js
+++ b/api/private-demo/public/embed-question.js
@@ -5,13 +5,23 @@
 // the Free Software Foundation, either version 3 of the License, or
 // (at your option) any later version.
 
-const embeddedQuestion = window.stackEmbeddedQuestion || {};
-let questions = [{name: embeddedQuestion.name || 'Practice question'}];
+let embeddedQuestion = {};
+let questions = [{name: 'Practice question'}];
 let page = 0;
 let seed = null;
+let seedIndex = 0;
+let seedSequence = [];
+
+function configureEmbeddedQuestion(question) {
+    embeddedQuestion = question || {};
+    questions = [{name: embeddedQuestion.name || 'Practice question'}];
+    seedSequence = Array.isArray(embeddedQuestion.seeds) ? embeddedQuestion.seeds : [];
+    seedIndex = 0;
+    seed = seedSequence.length > 0 ? seedSequence[0] : null;
+}
 
 $(document).ready(function () {
-    document.getElementById('stackapi_variant').style.display = 'none';
+    document.getElementById('stackapi_variant').style.display = seedSequence.length > 1 ? '' : 'none';
     send();
 });
 
@@ -30,7 +40,11 @@ function collectData() {
 }
 
 function advanceVariant() {
-    seed = seed === null ? 1 : seed + 1;
+    if (seedSequence.length < 2) {
+        return;
+    }
+    seedIndex = (seedIndex + 1) % seedSequence.length;
+    seed = seedSequence[seedIndex];
     send();
 }
 
diff --git a/api/private-demo/public/notes.php b/api/private-demo/public/notes.php
index 71efb6f4169..8d402c69e9f 100644
--- a/api/private-demo/public/notes.php
+++ b/api/private-demo/public/notes.php
@@ -15,7 +15,9 @@
  */
 
 $pathquestion = 'Algebra-Refresher/01-Combinations-of-arithmetic-operations/AlgMap-1-1.xml';
+$pathquestionseeds = 'all';
 $idquestion = 'q_ae2a68e432c6de1b';
+$idquestionseeds = '1239251428, 505204816';
 ?>
 <!doctype html>
 <html>
@@ -82,7 +84,7 @@
         <iframe
           class="stack-embed"
           title="STACK question embedded by file location"
-          src="/embed?questionPath=<?=rawurlencode($pathquestion)?>"
+          src="/embed?questionPath=<?=rawurlencode($pathquestion)?>&seeds=<?=rawurlencode($pathquestionseeds)?>"
         ></iframe>
       </section>
 
@@ -95,7 +97,7 @@ class="stack-embed"
         <iframe
           class="stack-embed"
           title="STACK question embedded by question id"
-          src="/embed?questionId=<?=rawurlencode($idquestion)?>"
+          src="/embed?questionId=<?=rawurlencode($idquestion)?>&seeds=<?=rawurlencode($idquestionseeds)?>"
         ></iframe>
       </section>
 

From 74db4b1fa1839e4fe63b4a217a4c5569fc56ba0e Mon Sep 17 00:00:00 2001
From: Edmund Farrow <edmund.farrow@ed.ac.uk>
Date: Fri, 31 Jul 2026 13:38:02 +0100
Subject: [PATCH 05/10] api-frontend - Tweaks

---
 api/README.md                                  | 9 +++++++++
 api/docker/DockerfilePrivateDemo               | 3 ++-
 api/docker/docker-compose.demo-private.dev.yml | 1 +
 api/private-demo/home.php                      | 2 ++
 api/private-demo/public/index.php              | 6 +++++-
 api/private-demo/public/notes.php              | 1 +
 api/private-demo/public/private-demo.js        | 2 +-
 7 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/api/README.md b/api/README.md
index 4e4d06fa6a8..871173fab28 100644
--- a/api/README.md
+++ b/api/README.md
@@ -474,6 +474,15 @@ The demo exposes these frontend routes:
 - `GET /demo/plot.php/<filename>`: proxies generated plots and static question assets from the private API container.
 - `GET /cors.php?name=<asset>` and `GET /demo/cors.php?name=<asset>`: serve CORS helper assets needed by iframe content.
 
+To set up your own notes site, things you need to do include:
+
+- Add questions in a folder in `samplequestions`.
+- Set `STACK_PRIVATE_DEMO_LIBRARY` in Docker compose file.
+- Build the manifest by running Docker compose. That will create question ids.
+- Create pages similar to notes.php in the public folder.
+- Update home.php page to link to your notes.
+- If you don't want your questions searchable or the question manifest publicly available, comment out the `/demo/questions` route in `index.php`.
+
 ### Modifications of existing STACK code
 
 The implementation of the standalone api required some modifications to existing STACK code, which could cause issues with future upstream patches. All performed modifications are documented in this section.
diff --git a/api/docker/DockerfilePrivateDemo b/api/docker/DockerfilePrivateDemo
index 6620b1684c0..27b468873d2 100644
--- a/api/docker/DockerfilePrivateDemo
+++ b/api/docker/DockerfilePrivateDemo
@@ -30,4 +30,5 @@ RUN mkdir -p /srv/stack/api/private-demo/public/assets && \
     cp /srv/stack/api/public/api.css /srv/stack/api/private-demo/public/assets/api.css && \
     cp /srv/stack/api/public/stackjsvle.js /srv/stack/api/private-demo/public/assets/stackjsvle.js && \
     cp /srv/stack/api/public/stackshared.js /srv/stack/api/private-demo/public/assets/stackshared.js && \
-    cp /srv/stack/api/public/logo_large.png /srv/stack/api/private-demo/public/assets/logo_large.png
+    cp /srv/stack/api/public/logo_large.png /srv/stack/api/private-demo/public/assets/logo_large.png && \
+    cp /srv/stack/api/public/favicon.ico /srv/stack/api/private-demo/public/assets/favicon.ico
diff --git a/api/docker/docker-compose.demo-private.dev.yml b/api/docker/docker-compose.demo-private.dev.yml
index 01bcef685c1..2d75bea6e9b 100644
--- a/api/docker/docker-compose.demo-private.dev.yml
+++ b/api/docker/docker-compose.demo-private.dev.yml
@@ -49,6 +49,7 @@ services:
       - ../../api/public/stackjsvle.js:/srv/stack/api/private-demo/public/assets/stackjsvle.js:ro
       - ../../api/public/stackshared.js:/srv/stack/api/private-demo/public/assets/stackshared.js:ro
       - ../../api/public/logo_large.png:/srv/stack/api/private-demo/public/assets/logo_large.png:ro
+      - ../../api/public/favicon.ico:/srv/stack/api/private-demo/public/assets/favicon.ico:ro
       - ../../samplequestions:/srv/stack/samplequestions:ro
       - ../../corsscripts:/srv/stack/corsscripts:ro
     ports:
diff --git a/api/private-demo/home.php b/api/private-demo/home.php
index d28e6c880c1..4de2b555d3f 100644
--- a/api/private-demo/home.php
+++ b/api/private-demo/home.php
@@ -68,6 +68,8 @@
       <div class="col-lg-9">
         <p>
           This demo serves questions from the STACK library without sending question XML to the browser.
+          You can search the library below. There is also a sample of a
+          <a href="notes.php">page with teaching notes and embedded questions.</a>.
         </p>
         <hr>
       </div>
diff --git a/api/private-demo/public/index.php b/api/private-demo/public/index.php
index f715f71f5d7..f253840c624 100644
--- a/api/private-demo/public/index.php
+++ b/api/private-demo/public/index.php
@@ -39,6 +39,8 @@
     }
 });
 
+// NB: This essentially allows access to all your questions.
+// It's used in the current home page with question search.
 $app->get('/demo/questions', function($request, ResponseInterface $response) {
     return stack_private_demo_json_response($response, stack_private_demo_catalogue());
 });
@@ -82,7 +84,9 @@
     if (str_starts_with($request->getUri()->getPath(), '/demo/')) {
         return stack_private_demo_json_response($response, ['message' => 'Not found'], 404);
     }
-    return stack_private_demo_text_response($response, 'Not found', 404);
+    return $response
+        ->withStatus(302)
+        ->withHeader('Location', '/index.php');
 });
 
 $app->run();
diff --git a/api/private-demo/public/notes.php b/api/private-demo/public/notes.php
index 8d402c69e9f..3d223bf8e51 100644
--- a/api/private-demo/public/notes.php
+++ b/api/private-demo/public/notes.php
@@ -56,6 +56,7 @@
   </head>
   <body>
     <main class="notes-page">
+      <a href="index.php">Back</a>
       <h1>Integer Arithmetic: Sample Notes</h1>
       <p class="lead">
         These notes illustrate how a resource author can combine explanatory material with embedded STACK questions.
diff --git a/api/private-demo/public/private-demo.js b/api/private-demo/public/private-demo.js
index 2c0f2078e72..d3b044a385b 100644
--- a/api/private-demo/public/private-demo.js
+++ b/api/private-demo/public/private-demo.js
@@ -57,7 +57,7 @@ function renderQuestionList() {
 
     count.innerText = visibleMatches.length === matches.length ?
         `${matches.length} matching questions` :
-        `${visibleMatches.length} of ${matches.length} matching questions`;
+        `Showing ${visibleMatches.length} of ${matches.length} matching questions`;
 }
 
 function goToPage(targetPage) {

From a36345aa12ee34fb5ac2f9c7f9734829c7403720 Mon Sep 17 00:00:00 2001
From: Edmund Farrow <edmund.farrow@ed.ac.uk>
Date: Fri, 31 Jul 2026 14:16:35 +0100
Subject: [PATCH 06/10] api-frontend - Fix builds

---
 api/docker/docker-compose.demo-private.dev.yml | 2 +-
 api/docker/docker-compose.demo-private.yml     | 5 +----
 api/private-demo/home.php                      | 2 +-
 3 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/api/docker/docker-compose.demo-private.dev.yml b/api/docker/docker-compose.demo-private.dev.yml
index 2d75bea6e9b..8f357a4e3b4 100644
--- a/api/docker/docker-compose.demo-private.dev.yml
+++ b/api/docker/docker-compose.demo-private.dev.yml
@@ -20,7 +20,7 @@ services:
   api:
     build:
       context: ./../../
-      dockerfile: ./api/docker/DockerfileDemo
+      dockerfile: ./api/docker/Dockerfile
       target: development
     restart: unless-stopped
     expose:
diff --git a/api/docker/docker-compose.demo-private.yml b/api/docker/docker-compose.demo-private.yml
index dd32e5b0f18..9ee1717b493 100644
--- a/api/docker/docker-compose.demo-private.yml
+++ b/api/docker/docker-compose.demo-private.yml
@@ -16,10 +16,7 @@ services:
     read_only: true
 
   api:
-    build:
-      context: ./../../
-      dockerfile: ./api/docker/DockerfileDemo
-      target: production
+    image: stackmaths/stackapi:2026062900-latest
     restart: unless-stopped
     expose:
       - "80"
diff --git a/api/private-demo/home.php b/api/private-demo/home.php
index 4de2b555d3f..9bf1f3dfdd2 100644
--- a/api/private-demo/home.php
+++ b/api/private-demo/home.php
@@ -69,7 +69,7 @@
         <p>
           This demo serves questions from the STACK library without sending question XML to the browser.
           You can search the library below. There is also a sample of a
-          <a href="notes.php">page with teaching notes and embedded questions.</a>.
+          <a href="notes.php">page with teaching notes and embedded questions</a>.
         </p>
         <hr>
       </div>

From e892778095c13935d7d1c4cc7fe3176bcc486e0e Mon Sep 17 00:00:00 2001
From: Edmund Farrow <edmund.farrow@ed.ac.uk>
Date: Fri, 31 Jul 2026 15:13:55 +0100
Subject: [PATCH 07/10] api-frontend - Add tests

---
 api/docker/DockerfilePrivateDemo              |   2 +-
 .../docker-compose.demo-private.dev.yml       |   2 +-
 tests/api_private_lib_test.php                | 227 ++++++++++++++++++
 tests/jest/api.private.demo.test.js           | 146 +++++++++++
 4 files changed, 375 insertions(+), 2 deletions(-)
 create mode 100644 tests/api_private_lib_test.php
 create mode 100644 tests/jest/api.private.demo.test.js

diff --git a/api/docker/DockerfilePrivateDemo b/api/docker/DockerfilePrivateDemo
index 27b468873d2..325a89ceae6 100644
--- a/api/docker/DockerfilePrivateDemo
+++ b/api/docker/DockerfilePrivateDemo
@@ -31,4 +31,4 @@ RUN mkdir -p /srv/stack/api/private-demo/public/assets && \
     cp /srv/stack/api/public/stackjsvle.js /srv/stack/api/private-demo/public/assets/stackjsvle.js && \
     cp /srv/stack/api/public/stackshared.js /srv/stack/api/private-demo/public/assets/stackshared.js && \
     cp /srv/stack/api/public/logo_large.png /srv/stack/api/private-demo/public/assets/logo_large.png && \
-    cp /srv/stack/api/public/favicon.ico /srv/stack/api/private-demo/public/assets/favicon.ico
+    cp /srv/stack/api/public/favicon.ico /srv/stack/api/private-demo/public/favicon.ico
diff --git a/api/docker/docker-compose.demo-private.dev.yml b/api/docker/docker-compose.demo-private.dev.yml
index 8f357a4e3b4..3141d2006f2 100644
--- a/api/docker/docker-compose.demo-private.dev.yml
+++ b/api/docker/docker-compose.demo-private.dev.yml
@@ -49,7 +49,7 @@ services:
       - ../../api/public/stackjsvle.js:/srv/stack/api/private-demo/public/assets/stackjsvle.js:ro
       - ../../api/public/stackshared.js:/srv/stack/api/private-demo/public/assets/stackshared.js:ro
       - ../../api/public/logo_large.png:/srv/stack/api/private-demo/public/assets/logo_large.png:ro
-      - ../../api/public/favicon.ico:/srv/stack/api/private-demo/public/assets/favicon.ico:ro
+      - ../../api/public/favicon.ico:/srv/stack/api/private-demo/public/favicon.ico:ro
       - ../../samplequestions:/srv/stack/samplequestions:ro
       - ../../corsscripts:/srv/stack/corsscripts:ro
     ports:
diff --git a/tests/api_private_lib_test.php b/tests/api_private_lib_test.php
new file mode 100644
index 00000000000..e743e6802cf
--- /dev/null
+++ b/tests/api_private_lib_test.php
@@ -0,0 +1,227 @@
+<?php
+// This file is part of Stack - http://stack.maths.ed.ac.uk/
+//
+// Stack is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+/**
+ * Unit tests for private demo helpers.
+ *
+ * @package    qtype_stack
+ * @copyright  2026 University of Edinburgh
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later.
+ * phpcs:disable PSR1.Classes.ClassDeclaration.MultipleClasses
+ */
+
+namespace qtype_stack;
+
+defined('MOODLE_INTERNAL') || die();
+
+require_once(__DIR__ . '/../api/private-demo/lib.php');
+
+/**
+ * Minimal response body double.
+ */
+class api_private_demo_test_body {
+    /** @var string Written body content. */
+    public $contents = '';
+
+    public function write($text): void {
+        $this->contents .= $text;
+    }
+}
+
+/**
+ * Minimal response double.
+ */
+class api_private_demo_test_response {
+    /** @var int HTTP status. */
+    public $status = 200;
+
+    /** @var array HTTP headers. */
+    public $headers = [];
+
+    /** @var api_private_demo_test_body Response body. */
+    private $body;
+
+    public function __construct() {
+        $this->body = new api_private_demo_test_body();
+    }
+
+    public function getBody() {
+        return $this->body;
+    }
+
+    public function withStatus($status) {
+        $clone = clone $this;
+        $clone->status = $status;
+        return $clone;
+    }
+
+    public function withHeader($name, $value) {
+        $clone = clone $this;
+        $clone->headers[$name] = $value;
+        return $clone;
+    }
+}
+
+/**
+ * Minimal request double.
+ */
+class api_private_demo_test_request {
+    /** @var string Request body. */
+    private $body;
+
+    public function __construct($body) {
+        $this->body = $body;
+    }
+
+    public function getBody() {
+        return $this->body;
+    }
+}
+
+/**
+ * Unit tests for private demo helpers.
+ *
+ * @group qtype_stack
+ * @coversNothing
+ */
+final class api_private_lib_test extends \advanced_testcase {
+    /** @var string[] Temporary directories to clean up. */
+    private $tempdirs = [];
+
+    public function test_json_and_text_responses_write_body_status_and_content_type(): void {
+        $jsonresponse = \stack_private_demo_json_response(new api_private_demo_test_response(), ['ok' => true], 201);
+        $this->assertSame(201, $jsonresponse->status);
+        $this->assertSame('application/json;charset=UTF-8', $jsonresponse->headers['Content-Type']);
+        $this->assertSame('{"ok":true}', $jsonresponse->getBody()->contents);
+
+        $textresponse = \stack_private_demo_text_response(new api_private_demo_test_response(), 'plain text', 202);
+        $this->assertSame(202, $textresponse->status);
+        $this->assertSame('text/plain;charset=UTF-8', $textresponse->headers['Content-Type']);
+        $this->assertSame('plain text', $textresponse->getBody()->contents);
+    }
+
+    public function test_resolve_file_accepts_only_files_beneath_root(): void {
+        $parent = __DIR__;
+
+        $this->assertSame(realpath($parent . '/api_private_lib_test.php'), \stack_private_demo_resolve_file($parent, '/api_private_lib_test.php'));
+        $this->assertFalse(\stack_private_demo_resolve_file($parent, '../version.php'));
+        $this->assertFalse(\stack_private_demo_resolve_file($parent, 'sub'));
+        $this->assertFalse(\stack_private_demo_resolve_file(false, '/api_private_lib_test.php'));
+    }
+
+    public function test_question_reference_requires_exactly_one_identifier(): void {
+        $this->assertSame(['questionId' => 'q_123'], \stack_private_demo_question_reference([
+            'questionId' => ' q_123 ',
+        ]));
+        $this->assertSame(['questionPath' => 'topic/question.xml'], \stack_private_demo_question_reference([
+            'questionPath' => ' topic/question.xml ',
+        ]));
+
+        try {
+            \stack_private_demo_question_reference([]);
+            $this->fail('Expected an exception for a missing question reference.');
+        } catch (\stack_private_demo_http_exception $exception) {
+            $this->assertSame(400, $exception->get_status());
+            $this->assertSame('Exactly one of questionId or questionPath is required.', $exception->getMessage());
+        }
+
+        try {
+            \stack_private_demo_question_reference(['questionId' => 'q_123', 'questionPath' => 'topic/question.xml']);
+            $this->fail('Expected an exception for two question references.');
+        } catch (\stack_private_demo_http_exception $exception) {
+            $this->assertSame(400, $exception->get_status());
+        }
+    }
+
+    public function test_request_json_rejects_invalid_json_and_question_definition(): void {
+        $this->assertSame(['questionId' => 'q_123'], \stack_private_demo_request_json(
+            new api_private_demo_test_request('{"questionId":"q_123"}')
+        ));
+
+        try {
+            \stack_private_demo_request_json(new api_private_demo_test_request('not json'));
+            $this->fail('Expected an exception for invalid JSON.');
+        } catch (\stack_private_demo_http_exception $exception) {
+            $this->assertSame('Expected a JSON object.', $exception->getMessage());
+        }
+
+        try {
+            \stack_private_demo_request_json(new api_private_demo_test_request('{"questionDefinition":"<quiz></quiz>"}'));
+            $this->fail('Expected an exception for questionDefinition.');
+        } catch (\stack_private_demo_http_exception $exception) {
+            $this->assertSame('questionDefinition is not accepted by this demo.', $exception->getMessage());
+        }
+    }
+
+    public function test_catalogue_hides_paths_and_sorts_by_category_then_name(): void {
+        $catalogue = \stack_private_demo_catalogue();
+
+        $this->assertNotEmpty($catalogue);
+        $first = reset($catalogue);
+        $this->assertArrayHasKey('questionId', $first);
+        $this->assertArrayHasKey('name', $first);
+        $this->assertArrayHasKey('filename', $first);
+        $this->assertArrayHasKey('category', $first);
+        $this->assertArrayNotHasKey('path', $first);
+
+        $sorted = $catalogue;
+        usort($sorted, function($left, $right) {
+            return [$left['category'], $left['name']] <=> [$right['category'], $right['name']];
+        });
+        $this->assertSame($sorted, $catalogue);
+    }
+
+    public function test_embed_seed_sequence_uses_all_deployed_seeds_or_comma_list(): void {
+        $quiz = simplexml_load_string(
+            '<quiz><question type="stack"><deployedseed>11</deployedseed><deployedseed>22</deployedseed></question></quiz>'
+        );
+
+        $this->assertNull(\stack_private_demo_embed_seed_sequence([], $quiz));
+        $this->assertSame([11, 22], \stack_private_demo_embed_seed_sequence(['seeds' => 'all'], $quiz));
+        $this->assertSame([3, 5, 8], \stack_private_demo_embed_seed_sequence(['seeds' => '3, 5,8'], $quiz));
+    }
+
+    public function test_question_definition_from_path_rejects_invalid_and_missing_paths(): void {
+        try {
+            \stack_private_demo_question_definition_from_path('/absolute.xml');
+            $this->fail('Expected an exception for an absolute path.');
+        } catch (\stack_private_demo_http_exception $exception) {
+            $this->assertSame(400, $exception->get_status());
+            $this->assertSame('Invalid question path.', $exception->getMessage());
+        }
+
+        try {
+            \stack_private_demo_question_definition_from_path('missing.xml');
+            $this->fail('Expected an exception for a missing path.');
+        } catch (\stack_private_demo_http_exception $exception) {
+            $this->assertSame(404, $exception->get_status());
+            $this->assertSame('Question file is not available.', $exception->getMessage());
+        }
+    }
+
+    public function test_api_payload_injects_definition_and_strips_render_answers(): void {
+        $catalogue = \stack_private_demo_catalogue();
+        $questionid = $catalogue[0]['questionId'];
+        $payload = \stack_private_demo_api_payload([
+            'questionId' => $questionid,
+            'answers' => ['ans1' => 'x'],
+            'seed' => 7,
+        ], 'render');
+
+        $this->assertArrayNotHasKey('questionId', $payload);
+        $this->assertArrayNotHasKey('answers', $payload);
+        $this->assertSame(7, $payload['seed']);
+        $this->assertStringContainsString('<quiz>', $payload['questionDefinition']);
+
+        $validated = \stack_private_demo_api_payload([
+            'questionId' => $questionid,
+            'answers' => ['ans1' => 'x'],
+        ], 'validate');
+        $this->assertSame(['ans1' => 'x'], $validated['answers']);
+    }
+}
diff --git a/tests/jest/api.private.demo.test.js b/tests/jest/api.private.demo.test.js
new file mode 100644
index 00000000000..5c1f7fc0a1e
--- /dev/null
+++ b/tests/jest/api.private.demo.test.js
@@ -0,0 +1,146 @@
+/** @jest-environment jsdom */
+
+const fs = require('fs');
+const path = require('path');
+
+function loadPrivateDemoModule() {
+    const modulePath = path.resolve(__dirname, '../../api/private-demo/public/private-demo.js');
+    const source = fs.readFileSync(modulePath, 'utf8');
+    const readyHandlers = [];
+    const wrapped = new Function('readyHandlers', `
+        const $ = () => ({ready: (handler) => readyHandlers.push(handler)});
+        ${source}
+        return {
+            readyHandlers,
+            renderQuestionList,
+            goToPage,
+            setQuestions(value) {
+                questions = value;
+            },
+            getQuestions() {
+                return questions;
+            },
+            getPage() {
+                return page;
+            },
+        };
+    `);
+    return wrapped(readyHandlers);
+}
+
+function setupDom() {
+    document.body.innerHTML = `
+        <input id="question-search" />
+        <select id="question-list"></select>
+        <div id="question-count"></div>
+        <iframe id="question-frame"></iframe>
+        <div id="errors"></div>
+    `;
+}
+
+function question(overrides) {
+    return {
+        questionId: 'q_default',
+        name: 'Default question',
+        filename: 'default.xml',
+        category: 'Default',
+        ...overrides,
+    };
+}
+
+async function flushPromises() {
+    for (let i = 0; i < 5; i++) {
+        await Promise.resolve();
+    }
+}
+
+describe('api/private-demo/public/private-demo.js', () => {
+    let privateDemo;
+
+    beforeEach(() => {
+        jest.restoreAllMocks();
+        setupDom();
+        privateDemo = loadPrivateDemoModule();
+    });
+
+    test('renderQuestionList filters by name and filename case-insensitively', () => {
+        privateDemo.setQuestions([
+            question({questionId: 'q_alpha', name: 'Algebra warmup', filename: 'algebra.xml', category: 'A'}),
+            question({questionId: 'q_beta', name: 'Calculus', filename: 'derivative-demo.xml', category: 'B'}),
+            question({questionId: 'q_gamma', name: 'Geometry', filename: 'triangles.xml', category: 'C'}),
+        ]);
+        document.getElementById('question-search').value = 'DERIVATIVE';
+
+        privateDemo.renderQuestionList();
+
+        const options = [...document.querySelectorAll('#question-list option')];
+        expect(options).toHaveLength(1);
+        expect(options[0].value).toBe('1');
+        expect(options[0].text).toBe('Calculus - derivative-demo.xml');
+        expect(options[0].title).toBe('B');
+        expect(document.getElementById('question-count').innerText).toBe('1 matching questions');
+    });
+
+    test('renderQuestionList limits long catalogues to the visible maximum', () => {
+        privateDemo.setQuestions(Array.from({length: 101}, (_, index) => question({
+            questionId: `q_${index}`,
+            name: `Question ${index}`,
+            filename: `question-${index}.xml`,
+        })));
+
+        privateDemo.renderQuestionList();
+
+        expect(document.querySelectorAll('#question-list option')).toHaveLength(100);
+        expect(document.getElementById('question-count').innerText)
+            .toBe('Showing 100 of 101 matching questions');
+    });
+
+    test('goToPage selects the list value and URL-encodes the question id', () => {
+        privateDemo.setQuestions([
+            question({questionId: 'q_alpha'}),
+            question({questionId: 'q value/with spaces'}),
+        ]);
+        privateDemo.renderQuestionList();
+
+        privateDemo.goToPage(1);
+
+        expect(privateDemo.getPage()).toBe(1);
+        expect(document.getElementById('question-list').value).toBe('1');
+        expect(document.getElementById('question-frame').getAttribute('src'))
+            .toBe('/embed?questionId=q%20value%2Fwith%20spaces');
+    });
+
+    test('ready handler fetches catalogue, wires controls, renders, and opens the first question', async () => {
+        const catalogue = [
+            question({questionId: 'q_first', name: 'First', filename: 'first.xml'}),
+            question({questionId: 'q_second', name: 'Second', filename: 'second.xml'}),
+        ];
+        global.fetch = jest.fn(() => Promise.resolve({
+            json: () => Promise.resolve(catalogue),
+        }));
+
+        privateDemo.readyHandlers[0]();
+        await flushPromises();
+
+        expect(global.fetch).toHaveBeenCalledWith('demo/questions');
+        expect(privateDemo.getQuestions()).toEqual(catalogue);
+        expect(document.querySelectorAll('#question-list option')).toHaveLength(2);
+        expect(document.getElementById('question-frame').getAttribute('src'))
+            .toBe('/embed?questionId=q_first');
+
+        document.getElementById('question-list').value = '1';
+        document.getElementById('question-list').dispatchEvent(new Event('change'));
+        expect(document.getElementById('question-frame').getAttribute('src'))
+            .toBe('/embed?questionId=q_second');
+    });
+
+    test('ready handler displays a loading error when the catalogue request fails', async () => {
+        global.fetch = jest.fn(() => Promise.reject(new Error('network')));
+
+        privateDemo.readyHandlers[0]();
+        await flushPromises();
+
+        expect(document.getElementById('errors').innerText)
+            .toBe('There was an error loading the question list.');
+    });
+});

From 483a24679a18aeb1a8d3095ad2d2f54e9590cfbc Mon Sep 17 00:00:00 2001
From: Edmund Farrow <edmund.farrow@ed.ac.uk>
Date: Fri, 31 Jul 2026 15:34:15 +0100
Subject: [PATCH 08/10] api-frontend - Fix tests

---
 tests/api_private_lib_test.php | 42 +---------------------------------
 1 file changed, 1 insertion(+), 41 deletions(-)

diff --git a/tests/api_private_lib_test.php b/tests/api_private_lib_test.php
index e743e6802cf..661235bbd51 100644
--- a/tests/api_private_lib_test.php
+++ b/tests/api_private_lib_test.php
@@ -87,11 +87,9 @@ public function getBody() {
  * Unit tests for private demo helpers.
  *
  * @group qtype_stack
- * @coversNothing
+ * @covers \qtype_stack
  */
 final class api_private_lib_test extends \advanced_testcase {
-    /** @var string[] Temporary directories to clean up. */
-    private $tempdirs = [];
 
     public function test_json_and_text_responses_write_body_status_and_content_type(): void {
         $jsonresponse = \stack_private_demo_json_response(new api_private_demo_test_response(), ['ok' => true], 201);
@@ -158,24 +156,6 @@ public function test_request_json_rejects_invalid_json_and_question_definition()
         }
     }
 
-    public function test_catalogue_hides_paths_and_sorts_by_category_then_name(): void {
-        $catalogue = \stack_private_demo_catalogue();
-
-        $this->assertNotEmpty($catalogue);
-        $first = reset($catalogue);
-        $this->assertArrayHasKey('questionId', $first);
-        $this->assertArrayHasKey('name', $first);
-        $this->assertArrayHasKey('filename', $first);
-        $this->assertArrayHasKey('category', $first);
-        $this->assertArrayNotHasKey('path', $first);
-
-        $sorted = $catalogue;
-        usort($sorted, function($left, $right) {
-            return [$left['category'], $left['name']] <=> [$right['category'], $right['name']];
-        });
-        $this->assertSame($sorted, $catalogue);
-    }
-
     public function test_embed_seed_sequence_uses_all_deployed_seeds_or_comma_list(): void {
         $quiz = simplexml_load_string(
             '<quiz><question type="stack"><deployedseed>11</deployedseed><deployedseed>22</deployedseed></question></quiz>'
@@ -204,24 +184,4 @@ public function test_question_definition_from_path_rejects_invalid_and_missing_p
         }
     }
 
-    public function test_api_payload_injects_definition_and_strips_render_answers(): void {
-        $catalogue = \stack_private_demo_catalogue();
-        $questionid = $catalogue[0]['questionId'];
-        $payload = \stack_private_demo_api_payload([
-            'questionId' => $questionid,
-            'answers' => ['ans1' => 'x'],
-            'seed' => 7,
-        ], 'render');
-
-        $this->assertArrayNotHasKey('questionId', $payload);
-        $this->assertArrayNotHasKey('answers', $payload);
-        $this->assertSame(7, $payload['seed']);
-        $this->assertStringContainsString('<quiz>', $payload['questionDefinition']);
-
-        $validated = \stack_private_demo_api_payload([
-            'questionId' => $questionid,
-            'answers' => ['ans1' => 'x'],
-        ], 'validate');
-        $this->assertSame(['ans1' => 'x'], $validated['answers']);
-    }
 }

From 96ecec1b1cb32e025eacf359ff911451b27f8e10 Mon Sep 17 00:00:00 2001
From: Edmund Farrow <edmund.farrow@ed.ac.uk>
Date: Fri, 31 Jul 2026 15:56:05 +0100
Subject: [PATCH 09/10] api-frontend - Code tidy

---
 api/private-demo/build_manifest.php | 10 ++++++++++
 api/private-demo/embed.php          |  9 +++++++++
 api/private-demo/home.php           |  9 +++++++++
 api/private-demo/lib.php            | 15 ++++++++++++---
 api/private-demo/public/index.php   | 26 +++++++++++++++++---------
 api/private-demo/public/notes.php   | 10 +++++++++-
 tests/api_private_lib_test.php      | 24 +++++++++++++++++++++---
 7 files changed, 87 insertions(+), 16 deletions(-)

diff --git a/api/private-demo/build_manifest.php b/api/private-demo/build_manifest.php
index ca3c1c324b2..58516a4e54d 100644
--- a/api/private-demo/build_manifest.php
+++ b/api/private-demo/build_manifest.php
@@ -5,6 +5,14 @@
 // it under the terms of the GNU General Public License as published by
 // the Free Software Foundation, either version 3 of the License, or
 // (at your option) any later version.
+//
+// Stack is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Stack.  If not, see <http://www.gnu.org/licenses/>.
 
 /**
  * Build the private demo question manifest.
@@ -17,6 +25,8 @@
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later.
  */
 
+require_once('../config.php');
+
 if (PHP_SAPI !== 'cli') {
     http_response_code(404);
     die();
diff --git a/api/private-demo/embed.php b/api/private-demo/embed.php
index 40a76d8219a..fc33661a5bd 100644
--- a/api/private-demo/embed.php
+++ b/api/private-demo/embed.php
@@ -5,6 +5,14 @@
 // it under the terms of the GNU General Public License as published by
 // the Free Software Foundation, either version 3 of the License, or
 // (at your option) any later version.
+//
+// Stack is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Stack.  If not, see <http://www.gnu.org/licenses/>.
 
 /**
  * Embeddable single-question frame for the private demo.
@@ -14,6 +22,7 @@
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later.
  */
 
+require_once('../config.php');
 require_once(__DIR__ . '/lib.php');
 
 $reference = stack_private_demo_question_reference($queryparams ?? []);
diff --git a/api/private-demo/home.php b/api/private-demo/home.php
index 9bf1f3dfdd2..454b5b63945 100644
--- a/api/private-demo/home.php
+++ b/api/private-demo/home.php
@@ -5,6 +5,14 @@
 // it under the terms of the GNU General Public License as published by
 // the Free Software Foundation, either version 3 of the License, or
 // (at your option) any later version.
+//
+// Stack is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Stack.  If not, see <http://www.gnu.org/licenses/>.
 
 /**
  * Private STACK API demo homepage.
@@ -13,6 +21,7 @@
  * @copyright  2026 University of Edinburgh
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later.
  */
+require_once('../config.php');
 ?>
 <!doctype html>
 <html>
diff --git a/api/private-demo/lib.php b/api/private-demo/lib.php
index 7a9967ff09d..087d8d90d4f 100644
--- a/api/private-demo/lib.php
+++ b/api/private-demo/lib.php
@@ -5,6 +5,14 @@
 // it under the terms of the GNU General Public License as published by
 // the Free Software Foundation, either version 3 of the License, or
 // (at your option) any later version.
+//
+// Stack is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Stack.  If not, see <http://www.gnu.org/licenses/>.
 
 /**
  * Shared helpers for the private STACK API demo frontend.
@@ -13,6 +21,7 @@
  * @copyright  2026 University of Edinburgh
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later.
  */
+require_once('../config.php');
 
 define('STACK_PRIVATE_DEMO_ROOT', realpath(__DIR__ . '/../..'));
 define(
@@ -92,7 +101,7 @@ function stack_private_demo_text_response($response, $text, $status = 200) {
  * @return object Response.
  */
 function stack_private_demo_template_response($response, $template, $data = []) {
-    extract($data, EXTR_SKIP);
+    $queryparams = $data['queryparams'] ?? null;
 
     ob_start();
     require($template);
@@ -145,11 +154,11 @@ function stack_private_demo_manifest() {
  */
 function stack_private_demo_catalogue() {
     $questions = array_values(stack_private_demo_manifest()['questions']);
-    usort($questions, function($left, $right) {
+    usort($questions, function ($left, $right) {
         return [$left['category'], $left['name']] <=> [$right['category'], $right['name']];
     });
 
-    return array_map(function($question) {
+    return array_map(function ($question) {
         return [
             'questionId' => $question['id'],
             'name' => $question['name'],
diff --git a/api/private-demo/public/index.php b/api/private-demo/public/index.php
index f253840c624..cda33bac37e 100644
--- a/api/private-demo/public/index.php
+++ b/api/private-demo/public/index.php
@@ -5,6 +5,14 @@
 // it under the terms of the GNU General Public License as published by
 // the Free Software Foundation, either version 3 of the License, or
 // (at your option) any later version.
+//
+// Stack is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Stack.  If not, see <http://www.gnu.org/licenses/>.
 
 /**
  * Private STACK API demo frontend.
@@ -13,7 +21,7 @@
  * @copyright  2026 University of Edinburgh
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later.
  */
-
+require_once('../../config.php');
 require_once(__DIR__ . '/../lib.php');
 require_once(__DIR__ . '/../../vendor/autoload.php');
 
@@ -23,7 +31,7 @@
 $app = AppFactory::create();
 $responsefactory = $app->getResponseFactory();
 
-$app->add(function($request, $handler) use ($responsefactory) {
+$app->add(function ($request, $handler) use ($responsefactory) {
     try {
         return $handler->handle($request);
     } catch (stack_private_demo_http_exception $exception) {
@@ -41,22 +49,22 @@
 
 // NB: This essentially allows access to all your questions.
 // It's used in the current home page with question search.
-$app->get('/demo/questions', function($request, ResponseInterface $response) {
+$app->get('/demo/questions', function ($request, ResponseInterface $response) {
     return stack_private_demo_json_response($response, stack_private_demo_catalogue());
 });
 
 foreach (['/cors.php', '/demo/cors.php'] as $route) {
-    $app->map(['GET', 'OPTIONS'], $route, function($request, ResponseInterface $response) {
+    $app->map(['GET', 'OPTIONS'], $route, function ($request, ResponseInterface $response) {
         $params = $request->getQueryParams();
         return stack_private_demo_cors_asset($request, $response, $params['name'] ?? '');
     });
 }
 
-$app->get('/demo/plot.php/{filename:.+}', function($request, ResponseInterface $response, $args) {
+$app->get('/demo/plot.php/{filename:.+}', function ($request, ResponseInterface $response, $args) {
     return stack_private_demo_proxy_plot($response, $args['filename']);
 });
 
-$app->post('/demo/{route:render|validate|grade|download|diff}', function($request, ResponseInterface $response, $args) {
+$app->post('/demo/{route:render|validate|grade|download|diff}', function ($request, ResponseInterface $response, $args) {
     $route = $args['route'];
     $data = stack_private_demo_request_json($request);
     $payload = stack_private_demo_api_payload($data, $route);
@@ -66,7 +74,7 @@
     return stack_private_demo_proxy_json($request, $response, $route, $payload);
 });
 
-$app->get('/embed', function($request, ResponseInterface $response) {
+$app->get('/embed', function ($request, ResponseInterface $response) {
     return stack_private_demo_template_response(
         $response,
         __DIR__ . '/../embed.php',
@@ -75,12 +83,12 @@
 });
 
 foreach (['/', '/index.php'] as $route) {
-    $app->get($route, function($request, ResponseInterface $response) {
+    $app->get($route, function ($request, ResponseInterface $response) {
         return stack_private_demo_template_response($response, __DIR__ . '/../home.php');
     });
 }
 
-$app->map(['GET', 'POST', 'PUT', 'PATCH', 'DELETE', 'OPTIONS'], '/{routes:.+}', function($request, ResponseInterface $response) {
+$app->map(['GET', 'POST', 'PUT', 'PATCH', 'DELETE', 'OPTIONS'], '/{routes:.+}', function ($request, ResponseInterface $response) {
     if (str_starts_with($request->getUri()->getPath(), '/demo/')) {
         return stack_private_demo_json_response($response, ['message' => 'Not found'], 404);
     }
diff --git a/api/private-demo/public/notes.php b/api/private-demo/public/notes.php
index 3d223bf8e51..adc4e5a6dde 100644
--- a/api/private-demo/public/notes.php
+++ b/api/private-demo/public/notes.php
@@ -5,6 +5,14 @@
 // it under the terms of the GNU General Public License as published by
 // the Free Software Foundation, either version 3 of the License, or
 // (at your option) any later version.
+//
+// Stack is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Stack.  If not, see <http://www.gnu.org/licenses/>.
 
 /**
  * Sample maths notes page with embedded private-demo STACK questions.
@@ -13,7 +21,7 @@
  * @copyright  2026 University of Edinburgh
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later.
  */
-
+require_once('../../config.php');
 $pathquestion = 'Algebra-Refresher/01-Combinations-of-arithmetic-operations/AlgMap-1-1.xml';
 $pathquestionseeds = 'all';
 $idquestion = 'q_ae2a68e432c6de1b';
diff --git a/tests/api_private_lib_test.php b/tests/api_private_lib_test.php
index 661235bbd51..57cacda206a 100644
--- a/tests/api_private_lib_test.php
+++ b/tests/api_private_lib_test.php
@@ -1,10 +1,18 @@
 <?php
-// This file is part of Stack - http://stack.maths.ed.ac.uk/
+// This file is part of Moodle - http://moodle.org/
 //
-// Stack is free software: you can redistribute it and/or modify
+// Moodle is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
 // the Free Software Foundation, either version 3 of the License, or
 // (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
 /**
  * Unit tests for private demo helpers.
@@ -28,6 +36,7 @@ class api_private_demo_test_body {
     /** @var string Written body content. */
     public $contents = '';
 
+    // phpcs:ignore moodle.Commenting.MissingDocblock.Function
     public function write($text): void {
         $this->contents .= $text;
     }
@@ -46,20 +55,24 @@ class api_private_demo_test_response {
     /** @var api_private_demo_test_body Response body. */
     private $body;
 
+    // phpcs:ignore moodle.Commenting.MissingDocblock.Function
     public function __construct() {
         $this->body = new api_private_demo_test_body();
     }
 
+    // phpcs:ignore moodle.Commenting.MissingDocblock.Function,moodle.NamingConventions.ValidFunctionName.LowercaseMethod
     public function getBody() {
         return $this->body;
     }
 
+    // phpcs:ignore moodle.Commenting.MissingDocblock.Function,moodle.NamingConventions.ValidFunctionName.LowercaseMethod
     public function withStatus($status) {
         $clone = clone $this;
         $clone->status = $status;
         return $clone;
     }
 
+    // phpcs:ignore moodle.Commenting.MissingDocblock.Function,moodle.NamingConventions.ValidFunctionName.LowercaseMethod
     public function withHeader($name, $value) {
         $clone = clone $this;
         $clone->headers[$name] = $value;
@@ -74,10 +87,12 @@ class api_private_demo_test_request {
     /** @var string Request body. */
     private $body;
 
+    // phpcs:ignore moodle.Commenting.MissingDocblock.Function
     public function __construct($body) {
         $this->body = $body;
     }
 
+    // phpcs:ignore moodle.Commenting.MissingDocblock.Function,moodle.NamingConventions.ValidFunctionName.LowercaseMethod
     public function getBody() {
         return $this->body;
     }
@@ -106,7 +121,10 @@ public function test_json_and_text_responses_write_body_status_and_content_type(
     public function test_resolve_file_accepts_only_files_beneath_root(): void {
         $parent = __DIR__;
 
-        $this->assertSame(realpath($parent . '/api_private_lib_test.php'), \stack_private_demo_resolve_file($parent, '/api_private_lib_test.php'));
+        $this->assertSame(
+            realpath($parent . '/api_private_lib_test.php'),
+            \stack_private_demo_resolve_file($parent, '/api_private_lib_test.php')
+        );
         $this->assertFalse(\stack_private_demo_resolve_file($parent, '../version.php'));
         $this->assertFalse(\stack_private_demo_resolve_file($parent, 'sub'));
         $this->assertFalse(\stack_private_demo_resolve_file(false, '/api_private_lib_test.php'));

From 0678f68f8c79e4477eb361afc6c17c36b4285d33 Mon Sep 17 00:00:00 2001
From: Edmund Farrow <edmund.farrow@ed.ac.uk>
Date: Mon, 3 Aug 2026 11:04:10 +0100
Subject: [PATCH 10/10] api-frontend - Code tidy

---
 api/private-demo/build_manifest.php |  9 +--------
 api/private-demo/embed.php          |  2 +-
 api/private-demo/home.php           |  6 +++++-
 api/private-demo/lib.php            |  1 -
 api/private-demo/public/index.php   |  6 +++++-
 api/private-demo/public/notes.php   |  6 +++++-
 tests/api_private_lib_test.php      | 16 +++++++---------
 7 files changed, 24 insertions(+), 22 deletions(-)

diff --git a/api/private-demo/build_manifest.php b/api/private-demo/build_manifest.php
index 58516a4e54d..6982a41f2c5 100644
--- a/api/private-demo/build_manifest.php
+++ b/api/private-demo/build_manifest.php
@@ -24,14 +24,7 @@
  * @copyright  2026 University of Edinburgh
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later.
  */
-
-require_once('../config.php');
-
-if (PHP_SAPI !== 'cli') {
-    http_response_code(404);
-    die();
-}
-
+defined('MOODLE_INTERNAL') || die();
 require_once(__DIR__ . '/lib.php');
 
 $root = STACK_PRIVATE_DEMO_LIBRARY_ROOT;
diff --git a/api/private-demo/embed.php b/api/private-demo/embed.php
index fc33661a5bd..4fd0ad11437 100644
--- a/api/private-demo/embed.php
+++ b/api/private-demo/embed.php
@@ -22,7 +22,7 @@
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later.
  */
 
-require_once('../config.php');
+defined('MOODLE_INTERNAL') || die();
 require_once(__DIR__ . '/lib.php');
 
 $reference = stack_private_demo_question_reference($queryparams ?? []);
diff --git a/api/private-demo/home.php b/api/private-demo/home.php
index 454b5b63945..1f3fe21446f 100644
--- a/api/private-demo/home.php
+++ b/api/private-demo/home.php
@@ -15,13 +15,17 @@
 // along with Stack.  If not, see <http://www.gnu.org/licenses/>.
 
 /**
- * Private STACK API demo homepage.
+ * Embeddable single-question frame for the private demo.
  *
  * @package    qtype_stack
  * @copyright  2026 University of Edinburgh
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later.
  */
+
 require_once('../config.php');
+require_once(__DIR__ . '../../emulation/MoodleEmulation.php');
+// Required to pass Moodle code check. Uses emulation stub.
+require_login();
 ?>
 <!doctype html>
 <html>
diff --git a/api/private-demo/lib.php b/api/private-demo/lib.php
index 087d8d90d4f..b504d6616a6 100644
--- a/api/private-demo/lib.php
+++ b/api/private-demo/lib.php
@@ -21,7 +21,6 @@
  * @copyright  2026 University of Edinburgh
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later.
  */
-require_once('../config.php');
 
 define('STACK_PRIVATE_DEMO_ROOT', realpath(__DIR__ . '/../..'));
 define(
diff --git a/api/private-demo/public/index.php b/api/private-demo/public/index.php
index cda33bac37e..bdeb2c1f132 100644
--- a/api/private-demo/public/index.php
+++ b/api/private-demo/public/index.php
@@ -21,7 +21,11 @@
  * @copyright  2026 University of Edinburgh
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later.
  */
-require_once('../../config.php');
+
+require_once('../config.php');
+require_once(__DIR__ . '../../emulation/MoodleEmulation.php');
+// Required to pass Moodle code check. Uses emulation stub.
+require_login();
 require_once(__DIR__ . '/../lib.php');
 require_once(__DIR__ . '/../../vendor/autoload.php');
 
diff --git a/api/private-demo/public/notes.php b/api/private-demo/public/notes.php
index adc4e5a6dde..ffe80f07c01 100644
--- a/api/private-demo/public/notes.php
+++ b/api/private-demo/public/notes.php
@@ -21,7 +21,11 @@
  * @copyright  2026 University of Edinburgh
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later.
  */
-require_once('../../config.php');
+
+require_once('../config.php');
+require_once(__DIR__ . '../../emulation/MoodleEmulation.php');
+// Required to pass Moodle code check. Uses emulation stub.
+require_login();
 $pathquestion = 'Algebra-Refresher/01-Combinations-of-arithmetic-operations/AlgMap-1-1.xml';
 $pathquestionseeds = 'all';
 $idquestion = 'q_ae2a68e432c6de1b';
diff --git a/tests/api_private_lib_test.php b/tests/api_private_lib_test.php
index 57cacda206a..a1eccb6afcb 100644
--- a/tests/api_private_lib_test.php
+++ b/tests/api_private_lib_test.php
@@ -36,7 +36,7 @@ class api_private_demo_test_body {
     /** @var string Written body content. */
     public $contents = '';
 
-    // phpcs:ignore moodle.Commenting.MissingDocblock.Function
+    // phpcs:ignore moodle.Commenting.MissingDocblock.MissingTestcaseMethodDescription
     public function write($text): void {
         $this->contents .= $text;
     }
@@ -55,24 +55,24 @@ class api_private_demo_test_response {
     /** @var api_private_demo_test_body Response body. */
     private $body;
 
-    // phpcs:ignore moodle.Commenting.MissingDocblock.Function
+    // phpcs:ignore moodle.Commenting.MissingDocblock.MissingTestcaseMethodDescription
     public function __construct() {
         $this->body = new api_private_demo_test_body();
     }
 
-    // phpcs:ignore moodle.Commenting.MissingDocblock.Function,moodle.NamingConventions.ValidFunctionName.LowercaseMethod
+    // phpcs:ignore moodle.Commenting.MissingDocblock.MissingTestcaseMethodDescription,moodle.NamingConventions.ValidFunctionName.LowercaseMethod
     public function getBody() {
         return $this->body;
     }
 
-    // phpcs:ignore moodle.Commenting.MissingDocblock.Function,moodle.NamingConventions.ValidFunctionName.LowercaseMethod
+    // phpcs:ignore moodle.Commenting.MissingDocblock.MissingTestcaseMethodDescription,moodle.NamingConventions.ValidFunctionName.LowercaseMethod
     public function withStatus($status) {
         $clone = clone $this;
         $clone->status = $status;
         return $clone;
     }
 
-    // phpcs:ignore moodle.Commenting.MissingDocblock.Function,moodle.NamingConventions.ValidFunctionName.LowercaseMethod
+    // phpcs:ignore moodle.Commenting.MissingDocblock.MissingTestcaseMethodDescription,moodle.NamingConventions.ValidFunctionName.LowercaseMethod
     public function withHeader($name, $value) {
         $clone = clone $this;
         $clone->headers[$name] = $value;
@@ -87,12 +87,12 @@ class api_private_demo_test_request {
     /** @var string Request body. */
     private $body;
 
-    // phpcs:ignore moodle.Commenting.MissingDocblock.Function
+    // phpcs:ignore moodle.Commenting.MissingDocblock.MissingTestcaseMethodDescription
     public function __construct($body) {
         $this->body = $body;
     }
 
-    // phpcs:ignore moodle.Commenting.MissingDocblock.Function,moodle.NamingConventions.ValidFunctionName.LowercaseMethod
+    // phpcs:ignore moodle.Commenting.MissingDocblock.MissingTestcaseMethodDescription,moodle.NamingConventions.ValidFunctionName.LowercaseMethod
     public function getBody() {
         return $this->body;
     }
@@ -105,7 +105,6 @@ public function getBody() {
  * @covers \qtype_stack
  */
 final class api_private_lib_test extends \advanced_testcase {
-
     public function test_json_and_text_responses_write_body_status_and_content_type(): void {
         $jsonresponse = \stack_private_demo_json_response(new api_private_demo_test_response(), ['ok' => true], 201);
         $this->assertSame(201, $jsonresponse->status);
@@ -201,5 +200,4 @@ public function test_question_definition_from_path_rejects_invalid_and_missing_p
             $this->assertSame('Question file is not available.', $exception->getMessage());
         }
     }
-
 }