static function fetchAllObjectives($a_slm_object, $a_tree_node_id)
 {
     global $ilDB;
     $objectives = array();
     $seq_item = new ilSCORM2004Item($a_tree_node_id);
     $xpath_obj = new DOMXPath($seq_item->dom);
     $obj_node_list = $xpath_obj->query('//objective | //primaryObjective');
     for ($i = 0; $i < $obj_node_list->length; $i++) {
         $obj = new ilSCORM2004Objective();
         $obj->setNode($obj_node_list->item($i));
         $mapping_node_list = $xpath_obj->query('//objective | //primaryObjective');
         //check for mapping
         array_push($objectives, $obj);
     }
     return $objectives;
 }