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Re: UPA and schema handling

• To: xml-dev@l...
• Subject: Re: UPA and schema handling
• From: Ian Graham <ian.graham@u...>
• Date: Sun, 17 Oct 2004 18:24:10 -0400
• Cc: bob@o...
• In-reply-to: <4172BD45.7040409@o...>
• References: <41729D89.6020906@u...> <4172BD45.7040409@o...>
• User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040803

Seems unfortunate that vendors can just ignore normative portions of a 
spec. I can understand differences in implementation where the spec is 
complex, or unclear. But ignoring parts you don't like is simply goofy. 
To reuse your phrase, I would have to call that "bad art" rather than 
"state of the art" ;-/

Best --
Ian
Bob Foster wrote:
> Unique particle attribution is normative and not optional, but not all 
> processors check it correctly and some processors check it optionally. 
> Of course that leads to interoperability errors, and not just around 
> UPA, but that's the state of the art.
> 
> Bob Foster
> http://xmlbuddy.com/
> 
> Ian Graham wrote:
>  > I've been fiddling around with very simple schemas that violate the UPA
>  > constraint -- and have found that some schema tools flag UPA errors
>  > (e.g. oXygen), while others (e.g. XML spy) do not. This inconsistency
>  > is, at best, confusing -- but at worst would seem to lead to
>  > interoperability problems, since a designer could build a schema with
>  > one toolset and find it is not acceptable to another.
>  >
>  > So am I missing something here?  Is UPA really an inviolable constraint
>  > [my interpretation], or is it just a guideline, in the manner of
>  > Appendix E 'Deterministic Content Models (Non-Normative)' in the XML 1.0
>  > specification?  And if it's just a guideline, would this not lead to
>  > interoperability problems as I've just outlined?
>  >
>  > And, if someone already went down this rat hole, can anyone refer me to
>  > the corresponding xml-dev (or other) thread ;-)
>  >
>  > Best --
>  >
>  > Ian
> 
> 

-- 
Ian Graham
H: 416.769.2422 / W: 416.513.5656 / E: <ian . graham AT utoronto . ca>

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