/**
  * This method is an internal method used by parseXML method.
  *
  * @param elem XML element object.
  * @param responseSet Response Set.
  */
 public function setResponseSetAttributes($elem, ResponseSet $responseSet)
 {
     // get vers attribute
     $temp = $elem->getAttribute("vers");
     if ($temp != null) {
         $responseSet->setResponseSetVersion($temp);
     }
     // get service id
     $temp = $elem->getAttribute("svcid");
     if ($temp != null) {
         $responseSet->setServiceID($temp);
     }
     // get request id
     $temp = $elem->getAttribute("reqid");
     if ($temp != null) {
         $responseSet->setRequestSetID($temp);
     }
 }