Re: XML useful?

Well XQuery is a neat tool if you want to deal with XML databases where
you have a collection of XML documents. Basically XQuery allows you to
query this collection and output the result as another XML document,
you can then transform this document into HTML using XSLT and display
in on the web.

There's also an open source project called 'exist' that has an
excellent implementation of current XQuery standards.

Xquery not hard to learn if you know to use SQL and XPath.
Hope that helps