Re: Why XML Schema enforces UPA (was Re: a or b or both - mystery..)

[Murali Mani <mani@CS.UCLA.EDU>]

Thinking about this a little more --
It is unclear where the convergence of schema languages will be -- i think
it mostly will be that there will be these 2 classes of schema languages
-- one defined by XML Schema and other defined by RELAX and TREX.

Personally I am *very* biased towards RELAX, and think these schema
languages are very important. From what I see, I think there are quite a
significant amount of developers and researchers who disagree with XML
Schema.

I think it will be *very* unfortunate if other work of W3C also starts to
make XML Schema a core part. I think the XML Schema WG should probably be
more aware of this situation, and give the proper message to other WGs.

<warning>speaking for himself only</warning>

regards - murali.

On Wed, 18 Apr 2001, Murali Mani wrote:

>
> On Wed, 18 Apr 2001, Henry S. Thompson wrote:
>
> > Neither of these is the reason it's there in XML Schema.  It's there,
> > as its name in XML Schema, namely Unique Particle Attribution,
> > suggests, so _other_ aspects of the particles besides those involved
> > directly in validation can be relied on, e.g. annotations and
> > key/keyref/unique declarations.
> >
> > ht
>
> I think Henry Thompson knows my disagreement very well --
> Unique Particle Attribution as in XML Schema is *very* restrictive --
> Annotations and key/keyref/unique declarations require, if any,
> unambiguous grammars.
> I think we are *totally* screwing up document processing with these
> restrictions.
> I think we do not have an obvious solution here -- so we should work
> harder to get a solution, and not push forward one possible solution which
> has several negative points without analyzing all solutions.
>
> <warning>speaking for himself only</warning>
>
> regards - murali.
>
>
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