I picked up this book the other day (Linky) . Got a chance today to sit down and read the Introduction. Seems like the author is very excited with the opportunities XML brings to enterprise development. Makes me feel like I'll enjoy the book. So far, the most work I've done with XML is the web.xml file used in JSP/Servlets. Mapping can be very powerful and don't forget the parameters you can set in that file. Talk about low maintenance code, shit. You can just set the parameters (variables) in your XML config and they will carry over into your code wherever you called the parameter name. Gotta love that. Sorry to ramble but all this talk of XML has gotten me giddy.