At the moment a working group at the W3C to create a query language for XML databases or documents.
The current work can be found at: http://www.w3.org/XML/Query
XQuery, as it is commonly called, is a kind of SQL for XML data(bases). It is tightly connected to XPath 2.0 and XSLT 2.0.
At the moment no Tcl implementation exists, partially because XQuery uses XML Schema Validation extensivly. It would probably be quite easy to provide a Tcl interface to a XQuery engine like Saxon [L1 ] or Galax [L2 ].
NEM - Can anyone explain to me the advantage of XQuery? I use XML, XSLT and XPath a reasonable amount, and I find them useful technologies. But, of the small amount of XQuery examples I've seen, it seems to be for tasks which I can do just as easily with Tcl and tDOM. Is there a compelling reason for me to switch to XQuery? Is there some killer feature that I should be aware of?