[XERCESJ-1240] A choice between an empty sequence and 1 or more non-empty particles should allow an empty sequence.

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.9.0
• Fix Version/s: 2.9.1
• Component/s: XML Schema 1.0 Structures
• Assignee: Michael Glavassevich
• Reporter: Michael Glavassevich
• Created: 14/Mar/07 04:40
• Updated: 25/Aug/07 16:21
• Resolved: 14/Mar/07 20:44

Description

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.