From XQuery 1.0: An XML Query Language (W3C Working Draft 07 June 2001): "XML is an extremely versatile markup language, capable of labeling the information content of diverse data sources including structured and semi-structured documents, relational databases, and object repositories. A query language that uses the structure of XML intelligently can express queries across all these kinds of data, whether physically stored in XML or viewed as XML via middleware. Because query languages have traditionally been designed for specific kinds of data, most existing proposals for XML query languages are robust for particular types of data sources but weak for other types. This specification describes a new query language called XQuery, which is designed to be broadly applicable across all types of XML data sources."
Article describing five practical scenarios that should give you ideas for leveraging XQuery in your own applications.
A set of XQuery example functions to perform useful tasks like substrings, modifying elements and manipulating namespaces.
Home of the W3C's XML Query working group, whose work includes XQuery and XPath.
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