static function question_identifier($question)
 {
     $catalog_name = MoodleUtil::get_catalog_name();
     $result = "{$catalog_name}:Q_" . str_pad($question->id, 8, '0', STR_PAD_LEFT);
     return $result;
 }
 protected function add_question_metadata(ImsXmlWriter $item, $question)
 {
     $result = $item->add_metadata('lom', '1.0');
     $lom = new LomWriter($result, 'lom');
     $general = $lom->add_general();
     $general->add_title($question->name);
     $general->add_identifier(MoodleUtil::get_catalog_name(), $question->id);
     $lifecycle = $lom->add_lifecycle();
     $lifecycle->add_status();
     return $result;
 }