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https://issues.apache.org/jira/browse/XERCESJ-1240?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Glavassevich reassigned XERCESJ-1240:
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Assignee: Michael Glavassevich
> A choice between an empty sequence and 1 or more non-empty particles should
> allow an empty sequence.
> ----------------------------------------------------------------------------------------------------
>
> Key: XERCESJ-1240
> URL: https://issues.apache.org/jira/browse/XERCESJ-1240
> Project: Xerces2-J
> Issue Type: Bug
> Components: XML Schema Structures
> Affects Versions: 2.9.0
> Reporter: Michael Glavassevich
> Assigned To: Michael Glavassevich
> Priority: Minor
>
> Xerces currently handles one special case correctly; a choice between an
> empty sequence and one non-empty particle:
> <xs:choice>
> <xs:sequence/>
> <xs:element name="a"/>
> </xs:choice>
> but fails to produce the correct content model representation when more than
> one non-empty particle is specified:
> <xs:choice>
> <xs:sequence/>
> <xs:element name="a"/>
> <xs:element name="b"/>
> ...
> </xs:choice>
> If one (or more) of the choices is an empty sequence the CMBuilder needs to
> wrap the choice node (i.e. XSCMBinOp) in a zero-or-one (optional) node so
> that the content model produced will allow the empty sequence.
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