public RoundTripDemo() 
{

}

 public static  void main(String[] args) 
{
        run(new RoundTripDemo(), args);
}

 protected  void process(Document document) throws Exception 
{
        System.out.println("about to output: " + document);
        // output the document to DOM
        DOMWriter writer = new DOMWriter();
        org.w3c.dom.Document domDocument = writer.write(document);
        // parse back again
        DOMReader reader = new DOMReader();
        Document doc2 = reader.read(domDocument);
        System.out.println("parsed back again: " + doc2);
        // now lets output it again
        XMLWriter xmlWriter = new XMLWriter(System.out);
        xmlWriter.write(doc2);
}

Outputs the document to DOM, parse it back again then output it