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XQuery 1.1 is an extended version of XQuery 1.0. It adds a number of features, such as the group by clause, a windowing clause that allows a FLWOR expression to operate on subsequences of its input, a try/catch expression, and higher order functions. XQuery 1.1 was published as a W3C Working Draft on Dec. 15, 2009. It was developed by the XML Query WG.
