Add in privacy subsystem classes for GDPR compliance.

classes/privacy/provider.php

+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// 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/>.
+/**
+ * Privacy Subsystem implementation for qtype_stack
+ *
+ * @package    qtype_stack
+ * @copyright  2018 The University of Edinburgh
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+namespace qtype_stack\privacy;
+defined('MOODLE_INTERNAL') || die();
+/**
+ * Privacy Subsystem for qtype_stack implementing null_provider.
+ *
+ * @copyright  2018 The University of Edinburgh
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class provider implements \core_privacy\local\metadata\null_provider {
+    /**
+     * Get the language string identifier with the component's language
+     * file to explain why this plugin stores no data.
+     *
+     * @return  string
+     */
+    public static function get_reason() : string {
+        return 'privacy:metadata';
+    }
+}

doc/en/Developer/Development_history.md

@@ -2,6 +2,12 @@
 
 For current and future plans, see [Development track](Development_track.md) and [Future plans](Future_plans.md).
 
+## Version 4.2.1
+
+Released August 2018. 
+
+* Add in privacy subsystem classes for GDPR compliance.
+
 ## Version 4.2
 
 Released July 2018. 

lang/en/qtype_stack.php

@@ -29,6 +29,8 @@ $string['pluginnameadding'] = 'Adding a STACK question';
 $string['pluginnameediting'] = 'Editing a STACK question';
 $string['pluginnamesummary'] = 'STACK provides mathematical questions for the Moodle quiz.  These use a computer algebra system to establish the mathematical properties of the student\'s responses.';
 
+$string['privacy:metadata'] = 'The STACK question type plugin does not store any personal data.';
+
 // General strings.
 $string['errors'] = 'Errors';
 $string['debuginfo'] = 'Debug info';

version.php

@@ -24,15 +24,15 @@
 
 defined('MOODLE_INTERNAL') || die();
 
-$plugin->version   = 2018073000;
+$plugin->version   = 2018080600;
 $plugin->requires  = 2014051200;
 $plugin->cron      = 0;
 $plugin->component = 'qtype_stack';
 $plugin->maturity  = MATURITY_STABLE;
-$plugin->release   = '4.2 for Moodle 3.0+';
+$plugin->release   = '4.2.1 for Moodle 3.0+';
 
 $plugin->dependencies = array(
-    'qbehaviour_adaptivemultipart'     => 2015090900,
-    'qbehaviour_dfexplicitvaildate'    => 2015090900,
-    'qbehaviour_dfcbmexplicitvaildate' => 2015090900,
+    'qbehaviour_adaptivemultipart'     => 2018080600,
+    'qbehaviour_dfexplicitvaildate'    => 2018080600,
+    'qbehaviour_dfcbmexplicitvaildate' => 2018080600,
 );