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Re: What is Tag Soup?

• To: <xml-dev@l...>
• Subject: Re: What is Tag Soup?
• From: "Rick Jelliffe" <ricko@a...>
• Date: Mon, 21 Oct 2002 01:54:58 +1000
• References: <5.1.0.14.0.20021019095012.029f3888@m...>

From: "Sean McGrath" <sean.mcgrath@p...>

 > I think Rick's thinking (and I agree with it) is that rule based validation 
> constraints
> that concentrate on constraining aspects of the structure rather than the
> whole structure, do not "degrade" as extra constraints need to be added
> into the validation.

What he said.
 
> The theoretical expressibility of constraints in either grammer or rule
> based systems in not the central concern here. The concern is how
> robust the two approaches are in the face of (inevitable) real world
> change.
 
And Michael is right: we could image a grammar-based system in which the
grammar was open by default and multiple content models could be applied
in parallel to elements (sort-of like James Clark's solution to the <html:a>
inclusion exception problem, where he uses several RELAX NG schemas
in parallel.)   That would work (as far as constraining siblings: not a general
solution to marking up arbitrary data structures), but such a beast does
not exist.

Cheers
Rick Jelliffe

• References:
  • Re: What is Tag Soup?
    • From: Sean McGrath <sean.mcgrath@p...>

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