If you are attending JavaOne this year, I would recommend you attend this talk given by Jonathan Robie and Jason Hunter Distributed Bookstore: XQuery in Java™ Technology-Based SOA Applications; BOF-2097. Wednesday, 17 May, 8:30 p.m. I've seen the previews, and I'd highly recommend you take the time to attend this BOF. Both Jason and Jonathan are excellent speakers. Check out Jonathan Robie's blog or Jason's blog for more details.