Additional Resources
The URLs for each of the XQuery and related W3C documents were given earlier in the chapter.
XQuery is at an early stage of development so there are only a limited number of good additional resources available on the Web at present.
An important resource is the XML Query home page at W3C (http://www.w3.org/XML/Query).
The official archives of the W3C discussion list for XQuery (http://lists.w3.org/Archives/Public/www-ql/).
The XQuery Mailing List on YahooGroups.com (http://www.yahoogroups.com/group/xquery).
Some of the most useful resources are associated with XQuery demo implementations. Here are a few of the best sites to visit:
The X-Hive XQuery demo (http://www.x-hive.com/xquery/). It's one of the best XQuery demos at the time of writing.
Software AG's Quip implementation of XQuery (http://www.softwareag.com/developer/quip/default.htm).
OpenLink Software's XQuery Demo (http://demo.openlinksw.com:8891/xquery/demo.vsp).
Fatdog's XML Query Engine (http://www.fatdog.com/).