)
</syntaxhighlight>
Queries of this kind can cause deadlocks! If the original query and the new query perform updates on the same database, the second query will only be run after the first one has been executed, and the first query will wait for the second query forever. You should resort to [[{{Function|XQuery Module#xquery:fork-join|xquery:fork-join]] }} if you want to have full control on parallel query execution.
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