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https://issues.apache.org/jira/browse/VXQUERY-97?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13726758#comment-13726758
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Till Westmann commented on VXQUERY-97:
--------------------------------------
Every function that is in a op* namespace is not intended to be called
directly. These functions implement functionality that is exposed differently
(often by syntactic constructs of XQuery). E.g. opext:value-ge is the function
that implements ">=" for atomic values. So this works as designed. If one of
the functions is needed as a function call, we could consider to move it into a
different namespace.
> Can't create query functions using opext
> ----------------------------------------
>
> Key: VXQUERY-97
> URL: https://issues.apache.org/jira/browse/VXQUERY-97
> Project: VXQuery
> Issue Type: Bug
> Reporter: Steven Jacobs
> Assignee: Till Westmann
>
> It seems that custom functions using opext cannot be called as part of a
> query. The displayed error is "It is a static error if the expanded QName and
> number of arguments in a function call do not match the name and arity of a
> function signature in the static context."
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