DOM Example

    private Document plist;
    
    protected void setUp() 
      throws IOException, ParserConfigurationException, SAXException {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        factory.setNamespaceAware(true); // NEVER FORGET THIS!
        DocumentBuilder builder = factory.newDocumentBuilder();
        
        plist = builder.parse(new File("thunderbirdplist.xml"));
    }

    public void testNoTwoKeyElementsAreAdjacentDOM() {
       
        Element root = plist.getDocumentElement();
        Element dict = (Element) root.getElementsByTagName("dict").item(0);
        NodeList children = dict.getElementsByTagName("*");
        for (int i = 0; i < children.getLength(); i++) {
            Node element = children.item(i);
            if (element.getNodeName().equals("key")) {
                assertFalse(children.item(i+1).getNodeName().equals("key"));
                // effectively also tests that every key 
                // is followed by something
            }
        }
        
    }