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diff --git a/lib/plugins/core/QuestionnaireAssignmentPlugin.php b/lib/plugins/core/QuestionnaireAssignmentPlugin.php
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+++ b/lib/plugins/core/QuestionnaireAssignmentPlugin.php
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+<?php
+
+/**
+ * Interface QuestionnaireAssignmentPlugin
+ * Implement this interface if you want to relate Stud.IP-questionnaires to your plugin-contents.
+ * By storing an assignment you should set the range_type to something unique that is
+ * related to your plugin like "mytaskplugin". In all methods you should first check if the
+ * assignment is related to your plugin, because other QuestionnaireAssignmentPlugins might
+ * be installed as well.
+ */
+interface QuestionnaireAssignmentPlugin
+{
+    /**
+     * Returns if the questionnaire is viewable dependend on the assignment. Check for the range_type
+     * and range_id to see if the the assignment has to do with your plugin (and not with
+     * somebody else's plugin) and if type and id fit.
+     * @param QuestionnaireAssignment $questionnaire
+     * @return boolean
+     */
+    public function isQuestionnaireViewable(QuestionnaireAssignment $questionnaire);
+
+    /**
+     * Returns if the questionnaire is editable dependend on the assignment. Check for the range_type
+     * and range_id to see if the the assignment has to do with your plugin (and not with
+     * somebody else's plugin) and if type and id fit.
+     * @param QuestionnaireAssignment $questionnaire
+     * @return boolean
+     */
+    public function isQuestionnaireEditable(QuestionnaireAssignment $questionnaire);
+
+    /**
+     * The display name of the assignment.
+     * @param QuestionnaireAssignment $questionnaire
+     * @return string
+     */
+    public function getQuestionnaireAssignmentName(QuestionnaireAssignment $questionnaire);
+
+    /**
+     * This template will get displayed when someone at tools -> questionnaires
+     * wants to edit the contexts of the questionnaire. Maybe you don't want to provide a
+     * template here, so return null or just a readonly html-snippet.
+     *
+     * @param Questionnaire $questionnaire
+     *
+     * @return null|Flexi\Template
+     */
+    public function getQuestionnaireAssignmentEditTemplate(Questionnaire $questionnaire);
+
+    /**
+     * When the context of the questionnaire is stored at tools -> questionnaires (where
+     * the template from getQuestionnaireAssignmentEditTemplate was displayed) you should
+     * use this method to store your assignments as well.
+     * @param Questionnaire $questionnaire
+     * @return null
+     */
+    public function storeQuestionnaireAssignments(Questionnaire $questionnaire);
+}