A choice between an empty sequence and 1 or more non-empty particles should
allow an empty sequence.
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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
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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