'''XML and XQuery'''
* [http://phobos103.inf.uni-konstanz.de/xml15/ XML Technologies]. A full Our university course on XML, XPath, XQuery, XSLT, Validation, Databases, etc.
* [http://w3schools.com/xquery/default.asp XQuery Tutorial]. From W3 Schools.
* [http://www.progress.com/xquery/resources/tutorials/learning-xquery/xquery---a-guided-tour XQuery: A Guided Tour]. From the book "XQuery from the Experts".