• From: "Fuchs, Matthew" <matthew.fuchs@c...>
• To: "'francis@r...'" <francis@r...>
• Date: Tue, 21 Aug 2001 10:55:34 -0700

Yes, you can always "cheat" locally, and any of the old-time SGMLers will
tell you that many applications were built around applying multiple DTDs to
instances - to very good l.  However, you need to be careful not to perturb
the document so as to lose the original semantics.  In particular, if you're
engaging in some multi-party activity, there's likely a "blessed" schema and
you can't move too far from that (and you'll need to go back to it when
sending something).

Matthew

> -----Original Message-----
> From: Francis Norton [mailto:francis@r...]
> Sent: Tuesday, August 21, 2001 1:34 AM
> To: Fuchs, Matthew
> Cc: 'Richard Tobin'; xml-dev@l...
> Subject: Re: Namespaces, schemas, Simon's filters.
> 
> 
> "Fuchs, Matthew" wrote:
> > 
> >> 
> > But if elementFormDefault were in the instance, I wouldn't 
> need to rewrite a
> > schema I don't have write access to.
> > 
> XML Schema validation is designed round the principle that the message
> *reader* chooses the schema to validate against - that's why the spec
> has language like 
> 
> "The xsi:schemaLocation and xsi:noNamespaceSchemaLocation 
> attributes can
> be used in a document to provide hints as to the physical location of
> schema documents which may be used for ·assessment·."
> 
> So you are absolutely free to validate a transformed message against a
> transformed local copy of the schema - and thanks for providing such a
> good use case for a possibly counter-intuitive design feature.
> 
> Francis.
> 

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