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
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Source code and licensing
Standard is copyrighted by W3C, which grants a license to reproduce it in its original form.
Support for TEI
Documentation is available from W3C in English: http://www.w3.org/XML/Query/ .
- 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