Index: questiontype.php
===================================================================
RCS file: /cvsroot/moodle/moodle/question/type/questiontype.php,v
retrieving revision 1.171
diff -u -r1.171 questiontype.php
--- questiontype.php	22 Nov 2010 09:52:44 -0000	1.171
+++ questiontype.php	29 Nov 2010 15:43:02 -0000
@@ -1662,7 +1662,6 @@
      *      array with keys 'text', 'format' and 'itemid'. However, when we are
      *      importing, it will be an array with keys 'text', 'format' and 'files'
      * @param object $context the context the question is in.
-     * @param string $component indentifies the file area question.
      * @param string $filearea indentifies the file area questiontext, generalfeedback,answerfeedback.
      * @param integer $itemid identifies the file area.
      *
@@ -1777,4 +1776,28 @@
             return base64_decode($file->content);
         }
     }
+
+    /**
+     * If your question type has a datasets that are related to the question category 
+     * e.g. calculated questiontype then you should set this to true so that 
+     * the move_category_datasets() function wll be called when the question category is changed 
+     *
+     * @return true or false.
+     */
+    function has_category_datasets() {
+        return false ;
+    }
+    
+    /**
+     * If your question type has a datasets that are related to the question category 
+     * e.g. calculated questiontype then this function will be called 
+     * when the question category is changed. 
+     * the question parameter contains the last question table record with the new category value
+     * @return true or false.
+     */
+    
+    function move_category_datasets($question){
+        return true ;
+    }
+        
 }