Force to validate external DTD ?

Question

Hello everybody !
Actually I parse a XML document with validation feature turned on :
XMLReader parser = XMLReaderFactory.createXMLReader("org.apache.xerces.parsers.SAXParser");
parser.setFeature("http://xml.org/sax/features/validation", true);
parser.setContentHandler(myHandler);
parser.setErrorHandler(myHandler);
parser.parse("/XMLdoc/.../myDoc.xml");
DTD reference is specified in XML document :
<?xml version="1.0" standalone="no"?>
<!DOCTYPE root SYSTEM "file.dtd">
Does anybody know how to force XML validation according to external DTD not define in the document at parse time (I want user to make its own XML document without reference or handling DTD part) ?
Thanks for your help !

Answer 1

Then I'd recommend processing the file with DOM without validation, creating a second Document object with the proper DTD specified (or enough of it specified that you could supply the rest via an EntityResolver) and then copy the contents of the full Document into the new Document with no contents but with a good DTD.
Then, serialize it to a stream or String, and run it throught DOM a second time.
Kind of clunky, but it should work unless the file is huge.
If the file is huge, I'd write code to read the file as a character stream and put the DTD specificaiton in the data. Then process this modified version through DOM.
Dave Patterson