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https://issues.apache.org/jira/browse/DAFFODIL-2020?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16693685#comment-16693685
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Steve Lawrence commented on DAFFODIL-2020:
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{{Noticed that <xs:group ref="doesNotExist" />}} also causes the same issue. I
believe hidden groups are implemented using group refs, so this isn't all that
surprising, but probably means that the core issue isn't related to the
hiddenGroupRef property but to group refs.
> Infinite loop if the dfdl:hiddenGroupRef reference does not exist
> -----------------------------------------------------------------
>
> Key: DAFFODIL-2020
> URL: https://issues.apache.org/jira/browse/DAFFODIL-2020
> Project: Daffodil
> Issue Type: Bug
> Components: Front End
> Affects Versions: 2.2.0
> Reporter: Steve Lawrence
> Priority: Major
>
> Daffodil gets stuck in what appears to be an infinite loop if you have an
> {{xs:sequence}} that defines a {{dfdl:hiddenGroupRef}} where the reference
> does not resolve to anything, e.g.:
> {code:xml}
> ...
> <xs:sequence dfdl:hiddenGroupRef="doesNotExist" />
> ...{code}
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