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https://issues.apache.org/jira/browse/DAFFODIL-1189?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dave Thompson closed DAFFODIL-1189.
-----------------------------------
    Resolution: Fixed

Searched for and found 2 tests that include the specified format "if 
(fn:exists(x)) then x else error". Verified both tests are executed and pass. 
The test are:

- TestDFDLExpressions.test_exists_10
- TestDFDLExpressions.test_traceComplex

> 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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