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https://issues.apache.org/jira/browse/DAFFODIL-2562?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mike Beckerle updated DAFFODIL-2562:
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Fix Version/s: 3.5.0
> Optional element at end of choice branch triggers unparse error
> ---------------------------------------------------------------
>
> Key: DAFFODIL-2562
> URL: https://issues.apache.org/jira/browse/DAFFODIL-2562
> Project: Daffodil
> Issue Type: Bug
> Components: Back End
> Affects Versions: 3.2.0
> Reporter: Josh Adams
> Priority: Major
> Fix For: 3.5.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Given the following schema:
> {{ <xs:group name="groupOfChoice">
> <xs:sequence>
> <xs:element name="key" type="xs:string" dfdl:lengthKind="explicit"
> dfdl:length="1" />
> <xs:choice dfdl:choiceDispatchKey="{ ./ex:key }">
> <xs:sequence dfdl:choiceBranchKey="a">
> <xs:element name="elt_a" type="xs:string"
> dfdl:lengthKind="explicit" dfdl:length="3" />
> </xs:sequence>
> <xs:sequence dfdl:choiceBranchKey="b">
> <xs:element name="elt_b" type="xs:string"
> dfdl:lengthKind="explicit" dfdl:length="3" />
> <xs:element name="elt_c" type="xs:string"
> dfdl:lengthKind="explicit" dfdl:length="3"
> minOccurs="0" maxOccurs="1" dfdl:occursCountKind="expression"
> dfdl:occursCount="{ if (fn:exists(../ex:elt_b)) then 1 else 0 }" />
> </xs:sequence>
> </xs:choice>
> </xs:sequence>
> </xs:group>}}
> During unparse, the element following this group (the next element after
> elt_c) will have an invalid ERD and will trigger an unparse error.
> I've spent a fair amount of time looking at this, but was unable to find the
> root cause of this issue. I'm thinking that it must be something where the
> various stacks tracking the current element and next element are some how
> getting out of sync and when we are looking for the element after elt_c,
> Daffodil still thinks it is withing the choice containing elt_c.
> I will open a pull request with the test for this bug.
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