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RE: Validness, doctype, and Schema Instance

schema instance
> This is perfectly legal-- however there are a lot of situations where 
> the validity of a document is assumed by a business process. 
> For example 
> you and a trading partner are passing documents back and forth-- that 
> trading partner assumes your document is constructed according to an 
> agreed on DTD-- validity insures this.

Actually, trading partners invariably require more than validity. Validity
does NOT ensure conformance to "an agreed on DTD". A document is valid if it
conforms to any old DTD that it happens to reference.

This is a real practical problem because most XML parsers don't give you an
easy way of validating an incoming document against a specific DTD.

Michael Kay


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