private function _sxml2arr($sXml, $arr = null)
    {
        foreach ((array) $sXml as $key => $value) {
            if (is_object($value) || (is_array($value))) {
                $arr[$key] = $this->_sxml2arr($value);
            } else {
                $arr[$key] = $value;
            }
        }

        return $arr;
    }