Converting Dom Document object into XML file removes the DTD

Question

Hi All
My xml is dtd. I have one xml file. i changed the node value after that i want to create a xml file with the same name. I created new xml file but i am not seeing the old dtd in the new file. This process is done with the help of jaxp.
My code is given below
File fileInput = new File("input.xml");
          File fileOutput = new File("output.xml");
          DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
          factory.setExpandEntityReferences(false);
          DocumentBuilder builder = factory.newDocumentBuilder();
          Document document = builder.parse(fileInput);
          TransformerFactory tFactory = TransformerFactory.newInstance();
          Transformer transformer = tFactory.newTransformer();
transformer.setOutputProperty(javax.xml.transform.OutputKeys.INDENT, "true");
          transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");
          DOMSource source = new DOMSource(document);
          FileOutputStream fos = new FileOutputStream(fileOutput);
          StreamResult result = new StreamResult(fos);
          transformer.transform(source, result);
Thanks in advance

Answer 1

The Transformer API does not guarantee the preservation of that information. You may want to check the DOM L3 Load/Save package (http://java.sun.com/javase/6/docs/api/index.html). Alternatively, you may force things by setting the additional output properties 'doctype-public' and 'doctype-system'.