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https://issues.apache.org/jira/browse/DAFFODIL-1189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17264422#comment-17264422
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Steve Lawrence commented on DAFFODIL-1189:
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We actually want tests that contain "fn:exactly-one". The "fn:exists" that Mike
mentions is how the implementation of fn:exactly-one should work (which could
also be used as a workaround to not having fn:exactly-one). Do we have any
tests that contain that?
> DPath: implement fn:exactly-one
> -------------------------------
>
> Key: DAFFODIL-1189
> URL: https://issues.apache.org/jira/browse/DAFFODIL-1189
> Project: Daffodil
> Issue Type: Bug
> Components: DFDL Language
> Reporter: Taylor Wise
> Priority: Major
>
> Implement fn:exactly-one.
> There are two phases to this. One behaves like{code} if (fn:exists(x)) then x
> else error {code}. This is the version that we need first.
> Later, once DFDL-1118 is implemented this needs to be revisited. However,
> that's a separate issue. Not even creating a ticket for it. This task should
> be part of the implementation work for DFDL-1118.
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