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| '''Summary'''
|Evaluates {{Code|$expr}} as XQuery expression at runtime and returns the resulting items.<br />
|-
| '''Errors'''
|{{Error|BXXQ0001|#Errors}} the query contains [[XQuery Update#Updating Expressions|updating expressions]].
|-
| '''Examples'''
| '''Summary'''
|Opens {{Code|$uri}} as file, evaluates it as XQuery expression at runtime, and returns the resulting items.<br />
|-
| '''Errors'''
|{{Error|BXXQ0001|#Errors}} the query contains [[XQuery Update#Updating Expressions|updating expressions]].
|}
| '''Summary'''
|Similar to {{Code|fn:trace($expr, $msg)}}, but instead of a user-defined message, it emits the compile-time type and estimated result size of its argument.
|}
=Errors=
{| class="wikitable" width="100%"
! width="5%"|Code
! width="95%"|Description
|-
|{{Code|BXXQ0001}}
|A dynamically evaluated query must not contain any [[XQuery Update#Updating Expressions|updating expressions]].
|}
