public function getOrderByMap()
 {
     return array_merge(parent::getOrderByMap(), self::$order_by_map);
 }
 /**	
  * @action list
  * @param KalturaServerNodeFilter $filter
  * @param KalturaFilterPager $pager
  * @return KalturaServerNodeListResponse
  */
 public function listAction(KalturaServerNodeFilter $filter = null, KalturaFilterPager $pager = null)
 {
     if (!$filter) {
         $filter = new KalturaServerNodeFilter();
     }
     if (!$pager) {
         $pager = new KalturaFilterPager();
     }
     return $filter->getTypeListResponse($pager, $this->getResponseProfile(), null);
 }