public function updateAction()
    {
        $id = $_GET['id'];
        $value = $_GET['name'];

        $xml = new SimpleXMLElement('data/test.xml', null, true);
        $result = $xml->xpath('//level[@id="' . $id . '"]');
        $result[0]['name'] = $value;
        $xml->asXml("data/test.xml");

    }