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RE: Namespaces, schemas, Simon's filters.

• From: "Bullard, Claude L (Len)" <clbullar@i...>
• To: "Fuchs, Matthew" <matthew.fuchs@c...>
• Date: Tue, 21 Aug 2001 15:15:48 -0500

And they often used that description of "blessed DTD" 
much the same way Haley Mills referred to the Siamese 
cat in the Disney movie.

You have to scope the extents in which the process 
and artifacts apply.  Because these were likely to 
shift, you had to scope the reviews for changes too. 
However, it is one reason little DTDs turned into 
very big ones quickly.

Len 
http://www.mp3.com/LenBullard

Ekam sat.h, Vipraah bahudhaa vadanti.
Daamyata. Datta. Dayadhvam.h


-----Original Message-----
From: Fuchs, Matthew [mailto:matthew.fuchs@c...]

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.

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