factory.setIgnoringComments(false);
factory.setCoalescing(true);
factory.setValidating (false);
parser = factory.newDocumentBuilder ();
resolver = new MyURIResolver ();
resolver.addLookup(_lookuppath);
parser.setEntityResolver(resolver);
parser.setErrorHandler (new MyErrorListener (_output));
Document doc = parser.parse (xmlstring);
Element root = doc.getDocumentElement ();
collection.add(root);