public   static   void  writeXmlFile(Document doc, String filename) {
       try  {
          // Prepare the DOM document for writing
          Source source =  new  DOMSource(doc);

          // Prepare the output file
          File file =  new  File(filename);
          Result result =  new  StreamResult(file);

          // Write the DOM document to the file
          Transformer xformer = TransformerFactory.newInstance().newTransformer();
          xformer.transform(source, result);
      } catch (TransformerConfigurationException e){
        log("TransformerConfigurationException on writing xml: "+e.getMessage(), e);
      } catch  (TransformerException e){
        log("TransformerException on writing xml: "+e.getMessage(), e);
      }
  }