/**
  * @see EPSInterface::makeAddressString()
  */
 public function makeAddressString($sessionId, $address)
 {
     try {
         $makeAddressStringStdObject = new stdClass();
         $makeAddressStringStdObject->sessionId = $sessionId;
         $makeAddressStringStdObject->address = $address->toStdClass();
         $response = parent::makeAddressString($makeAddressStringStdObject);
         if (isset($response->return)) {
             $resultAddressString = new ResultAddressString($response->return);
         } else {
             $resultAddressString = null;
         }
         return $resultAddressString;
     } catch (SoapFault $sf) {
         throw new ServerException($sf);
     }
 }