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This article summarizes the most important features of the upcoming [http://www.w3.org/TR/xquery-30/ Version 3.0] of the XQuery language that have already been implemented in BaseX.
==Group By==
FLWOR expressions have been extended by the [http://www.w3.org/TR/xquery-30/#id-group-by group by] clause, which is well-established among relational database systems. Group by clauses can be used to group query results based on its values.
'''Example:'''
...michi?...
==Try/Catch==
The well-known [http://www.w3.org/TR/xquery-30/#id-try-catch try/catch] construct can be used to handle errors at runtime:
'''Example:'''
