ARC2::getRDFXMLSerializer PHP Метод

    static function getRDFXMLSerializer($a = '')
    {
        return ARC2::getSer('RDFXML', $a);
    }

 function _run_query($query)
 {
     $response = $this->sparqlservice->graph($query);
     if ($response->is_success()) {
         require_once MORIARTY_ARC_DIR . '/ARC2.php';
         $parser = ARC2::getRDFParser();
         $parser->parse(false, $response->body);
         $changeset = $this->revert_changes($parser->getSimpleIndex(0));
         $ser = ARC2::getRDFXMLSerializer();
         $response->body = $ser->getSerializedIndex($changeset);
     }
     return $response;
 }