public function getRawDocuments($returnType)
  {
    if ($returnType == DOC_TYPE_ARRAY) {
      $res = array();
      foreach ($this->_documents as $key => $value) {
        $res[$key] = CPS_Response::simpleXmlToArray($value);
      }
      return $res;
    } else if ($returnType == DOC_TYPE_STDCLASS) {
      $res = array();
      foreach ($this->_documents as $key => $value) {
        $res[$key] = CPS_Response::simpleXmlToStdClass($value);
      }
      return $res;
    }
    return $this->_documents;
  }