XQuery

Synopsis
Originally designed to query XML databases, but can do all types of transformation that XSLT can do. (See http://www.xml.com/pub/a/2005/03/09/xquery-v-xslt.html .)

Source code and licensing
Standard is copyrighted by W3C, which grants a license to reproduce it in its original form.

Documentation
Documentation is available from W3C in English: http://www.w3.org/XML/Query/.

Sample implementations
Open-source implementation available in Michael Kay's Saxon. Others listed at http://www.w3.org/XML/Query/.

Current version number and date of release
1.0 (W3C Recommendation 2007 January 23)

History of versions
See http://www.w3.org/XML/Query/.

Additional notes
Introductory readings:


 * 1) http://www.xml.com/pub/a/2005/03/02/xquery.html
 * 2) http://www.xml.com/pub/a/2005/03/23/xquery-2.html
 * 3) http://www.xml.com/pub/a/2006/06/14/scaling-up-with-xquery-part-1.html
 * 4) http://www.xml.com/pub/a/2006/06/21/scaling-up-with-xquery-part-2.html