public function __construct(\SimpleXMLElement $xml = null)
 {
     parent::__construct($xml);
     if (is_null($xml)) {
         return;
     }
     $this->service = (string) $xml->service;
     $this->action = (string) $xml->action;
 }
 public function __construct(\SimpleXMLElement $xml = null)
 {
     parent::__construct($xml);
     if (is_null($xml)) {
         return;
     }
     $this->object = (string) $xml->object;
     $this->parameter = (string) $xml->parameter;
     $this->action = (string) $xml->action;
 }