How to add DOCTYPE in XML using jaxp-1.2 ????

Question

Hi all,
I know this question has been asked at least 2000 times. But I couldn't find the answer from the previously posted messages.
I would like to create a new Document (actually a XML document) and to write it out into a file. Of course, to be useful, that document needs a DTD... But I can't find a way to create that DOCTYPE tag.
In fact, I get this error: org.apache.crimson.tree.DomEx: HIERARCHY_REQUEST_ERR: This node isn't allowed there.
       at org.apache.crimson.tree.XmlDocument.appendChild(XmlDocument.java:661)
       at ServiceManager.PlaylistDOM.createDoc(PlaylistDOM.java:99)
       at ServiceManager.PlaylistDOM.load(PlaylistDOM.java:52)
       at java.lang.Thread.run(Thread.java:536)The code I have is the following:
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
try {
    //create a factory and configure it
    DocumentBuilder builder = factory.newDocumentBuilder();
    playlistDoc = builder.newDocument();
    DOMImplementation impl = builder.getDOMImplementation();
    DocumentType doctype = impl.createDocumentType(ROOT_EL, null, "playlist.dtd");
    playlistDoc = impl.createDocument(null, ROOT_EL, doctype);
catch (ParserConfigurationException pce) {}
//create the root of the XML file
Element root = (Element) playlistDoc.createElement(ROOT_EL);
root.setAttribute(FRAME_ATTR, fNb);
playlistDoc.appendChild(root);
//now print it out into XML file
TransformerFactory tfactory = TransformerFactory.newInstance();
try {
    Transformer transformer = tfactory.newTransformer();
    DOMSource source = new DOMSource(playlistDoc.getDocumentElement());
    StreamResult res = new StreamResult(new File(filename));
    transformer.transform(source, res);
catch (TransformerConfigurationException tce) {}
catch (TransformerException te) {}Thank you for your help

Answer 1

add both SYSTEM and PUBLIC, then you will find PUBLIC :P
================
If the doctype-public or doctype-system attributes are specified, then the html output method should output a document type declaration immediately before the first element. The name following <!DOCTYPE should be HTML or html. If the doctype-public attribute is specified, then the output method should output PUBLIC followed by the specified public identifier; if the doctype-system attribute is also specified, it should also output the specified system identifier following the public identifier. If the doctype-system attribute is specified but the doctype-public attribute is not specified, then the output method should output SYSTEM followed by the specified system identifier.
reference: http://java.sun.com/j2se/1.4.1/docs/api/javax/xml/transform/OutputKeys.html