1. World Wide Web Consortium. Extensible Markup Language (XML) 1.0. W3C Recommendation, Feb. 10, 1998. See
http://www.w3.org/TR/1998/REC-xml-19980210
2. World Wide Web Consortium. XML Schema, Parts 0, 1, and 2. W3C Working Draft, April 7, 2000. See
http://www.w3.org/TR/xmlschema-0,-1, and-2
.
3. World Wide Web Consortium. XML Query Requirements. W3C Working Draft, Jan. 31, 2000. See
http://www.w3.org/TR/xmlquery-req
4. World Wide Web Consortium. XML Path Language (XPath) Version 1.0. W3C Recommendation, Nov. 16, 1999. See
http://www.w3.org/TR/xpath.html
5. J. Robie, J. Lapp, D. Schach. XML Query Language (XQL). See
http://www.w3.org/TandS/QL/QL98/pp/xql.html
.