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W3C: XML Query - http://www.w3.org/XML/Query/
Home of the W3C's XML Query working group, whose work includes XQuery and XPath.
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FunctX XQuery Functions: Hundreds of useful examples - http://www.xqueryfunctions.com
A set of XQuery example functions to perform useful tasks like substrings, modifying elements and manipulating namespaces.
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xqDoc - http://www.xqdoc.org/
A simple vendor-neutral solution for documenting XQuery modules, as well as tools to generate a user friendly presentation of this documentation.
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Five Practical XQuery Applications - http://www.devx.com/xml/Article/15618/
Article describing five practical scenarios that should give you ideas for leveraging XQuery in your own applications.
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