Question

I have a DOM Document (org.w3c.dom) but I need to be able to find elements by XPath and such. Which parser or library out there can provide this feature?

Answer 1

http://download.oracle.com/javase/6/docs/api/javax/xml/xpath/package-summary.html

The end of the page even has an example on how to use XPath on a DOM document :

// parse the XML as a W3C Document
DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
Document document = builder.parse(new File("/widgets.xml"));

XPath xpath = XPathFactory.newInstance().newXPath();
String expression = "/widgets/widget";
Node widgetNode = (Node) xpath.evaluate(expression, document, XPathConstants.NODE);