Schema Grammar validity question.

I've got three grammars with a potentially dubious substitution group chain.

In a.xsd we have an attribute group declaring ##other.

In b.xsd we have an extension of a type from c.xsd declaring an ID 
attribute.

In c.xsd we have the base type, which declares a single attribute and 
##other.

Now the question is, is this valid according to point 1.3 of this section?

http://www.w3.org/TR/xmlschema-1/#cos-ct-extends

The reason I ask is that I'm getting conflicting answers.  Xerces says 
its valid, but XSD 
(http://www.eclipse.org/modeling/mdt/?project=xsd#xsd) claims that it 
isn't valid.

So who's right and why?

Regards,

Chris Simmons.


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