DocumentBuilderFactory factory =
		      DocumentBuilderFactory.newInstance();
		 try  {
			DocumentBuilder builder = factory.newDocumentBuilder();
			Document document = builder.newDocument();
			Element root = (Element)document.createElement("rootElement"); 
			document.appendChild(root);
			root.appendChild(document.createTextNode("Some"));
			root.appendChild(document.createTextNode(" "));
			root.appendChild(document.createTextNode("text"));
			
		}  catch  (ParserConfigurationException pce) {
			// Parser with specified options can't be built
		      pce.printStackTrace();

        Document doc <-... 
        String filename <-...
         try  {
            Transformer xformer = TransformerFactory.newInstance()
.newTransformer().transform( new  DOMSource(doc),  new  StreamResult(file));
        }  catch  (Exception e) {
                 e.printStackTrace();
        }