XQuery is still in the development stage and isn't yet a finished Recommendation. Therefore, not many resources exist for learning more about XQuery, and there likely won't be until XQuery matures. However, there are some sites that discuss various aspects of XQuery.
XML.com (http://www.xml.com/pub/rg/XQuery)— This is a summary of articles on XML.com that are related to the development of XQuery.
IBM Developer Works (http://www-106.ibm.com/developerworks/xml/library/x-xquery.html)— This is the IBM site for developers working with XQuery and Java.
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