This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
XML parsers don't do content filtering. That's something you would have to do after the parsing is finished. If you were using a SAX or StAX parser instead of DOM, this kind of thing would be easier to implement because you have more control over the parsing process.