public static  void main(String[] args) 
{
        TestRunner.run(SelectSingleNodeTest.class);
}

 public  void testSelectSingleNode() throws Exception 
{
        Document document = getDocument("/xml/test/jimBrain.xml");
        Node node = document.selectSingleNode("/properties/client/threadsafe");
        assertTrue("Found a valid node", node != null);
        Element server = (Element) document
                .selectSingleNode("/properties/server");
        assertTrue("Found a valid server", server != null);
        Element root = document.getRootElement();
        server = (Element) root.selectSingleNode("/properties/server");
        assertTrue("Found a valid server", server != null);
        // try finding it via a relative path
        server = (Element) document.selectSingleNode("properties/server");
        assertTrue("Found a valid server", server != null);
        // now lets use a relative path
        Element connection = (Element) server.selectSingleNode("db/connection");
        assertTrue("Found a valid connection", connection != null);
}

 public  void testSteensBug() throws Exception 
{
        Document document = getDocument("/xml/schema/personal.xsd");
        String xpath = "/xs:schema/xs:element[@name='person']";
        assertNotNull("element is null", document.selectSingleNode(xpath));
        Element root = document.getRootElement();
        assertNotNull("element is null", root.selectSingleNode(xpath));
}

Test out Steen's bug