Inserting a node in XML and retaining the doc type

Question

Hi All,
I want to insert one new node in an XML. Using the following code I can do that. But the problem is if the XML has doc type declaration then its giving me problem. After inserting the node the transformer is removing my doc type declaration from the XML. I have to retain the doc type definition (including entity declaration) as it is in the original XML file.
The following is the code that I'm using.
Document vDoc = null;
try {
// Contruct the DOM document
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
vDoc = builder.newDocument();
Node vFormNode = vDoc.createElement("Form");
vDoc.appendChild(vFormNode);
// Convert into a String the DOM document
TransformerFactory tFactory = TransformerFactory.newInstance();
Transformer transformer = tFactory.newTransformer();
DOMSource source = new DOMSource(vDoc);
StringWriter sw = new StringWriter();
StreamResult result = new StreamResult(sw);
transformer.transform(source, result);
catch (Exception e) {
System.out.println("Error: " + e.getMessage());
}The doc type def. in the original file is some thing like this.
<!DOCTYPE article SYSTEM "someurl/TFJA.dtd"[
<!ENTITY T0001 SYSTEM ".\BTN_A_000112809_O_XML_IMAGES\BTN_A_000112809_O_T0001.gif" NDATA GIF>
<!ENTITY F0001 SYSTEM ".\BTN_A_000112809_O_XML_IMAGES\BTN_A_000112809_O_F0001g.gif" NDATA GIF>
<!ENTITY F0002 SYSTEM ".\BTN_A_000112809_O_XML_IMAGES\BTN_A_000112809_O_F0002g.jpg" NDATA JPEG>
]>I know that I can set up the doc type definition in the new XML using the following properties of the transformer.
transformer.setOutputProperty( OutputKeys.DOCTYPE_SYSTEM,"article" );
transformer.setOutputProperty( OutputKeys.DOCTYPE_PUBLIC,"my DTD def");
I cannot hard code the DTD def. as it can vary from one XML to another. Using doc.getDocType() I can get the doctype of the original XML. But is it is not returning the complete def. including entities declaration. Its giving me "someurl/TFJA.dtd".
Is there any way to retain the complete doc type in the original XML file? I don't have much experience in XML and this issue is eating my head.. Also do I have to modify the DTD to accommodate the new tags added in order to make it a valid XML?
Any help and sample code would be highly appreciated.

Answer 1

Hi,
I also had similar requirement and when searching i came across this post. Later i found the solution for this. Instead of hardcoding the doctype you can get it from Document as follows..Snippet from the code i used..
DocumentType doctype = document.getDoctype();
if(doctype != null) {
               String id = doctype.getSystemId();
               if(id == null || id.length() == 0)
                    return;
               transformer.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM, id);
               id = doctype.getPublicId();
               if(id == null || id.length() == 0)
                    return;
               transformer.setOutputProperty(OutputKeys.DOCTYPE_PUBLIC, id);
Hope this helps.
Regards,
Deepak