High Quality Content by WIKIPEDIA articles! An XML transformation language is a computer language designed specifically to transform an input XML document into an output XML document which satisfies some specific goal. XQuery is a full functional language, despite having "query" in the name. It is a de-facto standard used by Microsoft, Oracle, DB2, Mark Logic, etc., is the foundation for the XRX web programming model, and has a W3C recommendation for versions 0.9 and 1.0. XQuery is not written in XML itself like XSLT is, so its syntax is much lighter. The language is based on XPath 2.0. XQuery programs cannot have side-effects, just like XSLT and provides almost the same capabilities (for instance: declaring variables and functions, iterating over sequences, using W3C schema types), even though the program syntax are quite different.

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