How to output new /new other than new/

Question

I use dom to parse a document to xml String.if a xml node doesn't have node value ,it will output <new/> but not <new></new>.we use this format (<new></new>) to transfer with remote mechine,so how to output this format.
following is my sample code:
          DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
          DocumentBuilder builder = factory.newDocumentBuilder();
          Document document = builder.newDocument();
          Element root = document.createElement("root"); 
          document.appendChild(root); 
          Element child = document.createElement("new");
          root.appendChild(child);
          Transformer transformer = TransformerFactory.newInstance().newTransformer();
          Properties properties = transformer.getOutputProperties();
          properties.setProperty(OutputKeys.ENCODING, "utf-8");
          properties.setProperty(OutputKeys.METHOD, "xml");
          properties.setProperty(OutputKeys.VERSION, "1.0");
          properties.setProperty(OutputKeys.INDENT, "yes");
          properties.setProperty("{http://xml.apache.org/xslt}indent-amount", "4");
          transformer.setOutputProperties(properties);
          StringWriter sw = new StringWriter();
          transformer.transform(new DOMSource(document), new StreamResult(sw));
          System.out.println(sw.toString());I think that maybe to set some property to the transformer outputproperties.
but I don't know what property will done.
any suggestion is appreciated

Answer 1

Thanks for your respons.My manager has accentuated this format before .maybe I will ask why.
However I don't think it will done after adding child.appendChild(document.createTextNode(""));
it still output <new/>.
I have writed a function to format this xml String like this:
      * format <new/> String to <new></new>
      * @param xmlString
      * @return String
     public static String formatXml(String xmlString){
          int idx = xmlString.indexOf("/>");
          while(idx != -1){
               String temp = xmlString.substring(0,idx);
               int idx1 = temp.lastIndexOf("<");
               String key = temp.substring(idx1+1,idx);
               xmlString = xmlString.replaceAll("<" + key + "/>", "<" + key + "></" + key + ">");
               idx = xmlString.indexOf("/>");
          return xmlString;
     }but i still won't to use it less than the end.