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XQuery is to XML what SQL is to databases
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XQuery is a language for finding and extracting elements and attributes from XML documents.
Here is an example of what XQuery could solve:
"Select all CD records with a price less than $10 from the CD collection stored in cd_catalog.xml"
XQuery 1.0 and XPath 2.0 share the same data model and support the same functions and operators. If you have already studied XPath you will have no problems with understanding XQuery.
XQuery can be used to:
XQuery is compatible with several W3C standards, such as XML, Namespaces, XSLT, XPath, and XML Schema.
XQuery 1.0 became a W3C Recommendation in 2007.
You will learn a lot more about XQuery in our XQuery Tutorial.