RE: [xml-dev] Re: Language Theorie concerning XML Schema (heavy,at least to me)

• To: "'Michael Kay'" <mike@...>,"'Bob Foster'" <bob@...>,"'Henry S. Thompson'" <ht@...>
• Subject: RE: [xml-dev] Re: Language Theorie concerning XML Schema (heavy,at least to me)
• From: "Michael Kay" <mike@...>
• Date: Fri, 29 Apr 2005 09:49:13 +0100
• Cc: <xml-dev@...>
• In-reply-to:
• Thread-index: AcVMd55DXOtJaHGmRDCnlSIPuImiswAHoNvAAABEqtA=

> it leaves it up to the implementor to decide which 
> references *are* needed for validation, and as far as I can 
> see, an implementation that needs *all" references is 
> conformant according to the letter.
> 

Just to add to this with a concrete example: if a content model refers to
element E, then a validator needs to know all the elements in the
substitution group of E. If there's an element Z in the schema whose
substitition group membership is a dangling reference, do you say "I don't
know whether element Z is in the substitution group of E, therefore I can't
validate", or do you assume that Z isn't in the substitution group of E.
Same applies to a complex type derived by extension from an unknown base
type. I'm pretty sure the spec doesn't give you the answer to this.

Michael Kay
http://www.saxonica.com/

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