Hi Lenny,
The schema spec has the following constraint on model groups:
" Schema Component Constraint: Model Group Correct
2 Circular groups are disallowed. That is, within the {particles} of a group there
must not be
at any depth a particle whose {term} is the group itself."
However, that constraint does not apply to your example. Would you please open a
bugzilla bug for
that problem?
Thanks,
Khaled
Lenny Hoffman wrote:
> Hi All,
>
> I get the following message when parsing an input file with schema checking
> on:
>
> Message: No circular definitions are allowed: 'ValueGroup'
>
> A portion of my schema is defined as follows:
>
> <xs:complexType name="ObjectType">
> <xs:sequence>
> <xs:group ref="ValueGroup" minOccurs="0"
>maxOccurs="unbounded"/>
> </xs:sequence>
> </xs:complexType>
> <xs:group name="ValueGroup">
> <xs:choice>
> <xs:element name="Inherited" type="InheritedType"/>
> <xs:element name="Basic" type="BasicType"/>
> <xs:element name="String" type="StringType"/>
> </xs:choice>
> </xs:group>
> <xs:complexType name="InheritedType">
> <xs:complexContent>
> <xs:extension base="ValueType">
> <xs:group ref="ValueGroup" minOccurs="0"
>maxOccurs="unbounded"/>
> </xs:extension>
> </xs:complexType>
>
> Some sample XML would be:
>
> <Object>
> <Inherited name="ooObjectPlacementStrategy" position="0">
> <Inherited name="ooPdStrategy" position="0">
> <String name="mName" position="1">EvolveTest</String>
> <String name="mComment" position="2"/>
> </Inherited>
> <Basic name="mSeparateByOwner" position="4" type="uint8" value="1"/>
> </Inherited>
> <Basic name="mPagePlacement" position="2" type="uint8" value="7"/>
> </Object>
>
> The complaint is that InheritedType is included in ValueGroup, and includes
> ValueGroup. This is certainly circular from the schema's point of view, but
> is a natural outcome of generically modeling an object's data, which is what
> I am doing. Is such an arrangement really illegal? Or is it a constraint
> specific to Xerces' implementation? I was not able to locate any such
> constraint in the XML Schema specification (I may have missed it though).
> Also, when processing the same input with XML Spy, I do not get this error
> (I believe it uses MSXML).
>
> Thanks,
>
> Lenny
>
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