transformer.setOutputProperty(OutputKeys.METHOD, "xml");

        final StringWriter writer = new StringWriter();
        final StreamResult result = new StreamResult(writer);

        final DOMSource source = new DOMSource(node);
        transformer.transform(source, result);

        return writer.toString();
    }

    public void test_getChildUrlRules() {
        assertEquals("", new FessXpathTransformer() {