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...
The method is to perform the same constraint propagation in the type
domain which the namespace recommendation specifies for the instance domain.
synonomy and homography issues require scoping rules. just as they do in
the instance domain. for which they physical entity tree suffices. other
constraints (like on unprefixed names) are not necessary.
there was a thread back in may in response to some posts from C. M.
Sperberg-McQueen which has some examples.
...
Rick Jelliffe wrote:
>
> From: "Jonathan Borden" <jborden@mediaone.net>
>
> > This applies to both namespace and DTDs. Perhaps if anyone is really
> > interested in keeping DTDs alive, they might publish such a proposal to fix
> > the problem, accompanied by some software that implements the proposal. Then
> > we would be able to see if it flies.
>
> Actually, it does not even need any change in DTD syntax AFAIK.
> It just needs a change in the way that validation is performed using DTDs.
>
> The validator needs to understand that given
> <!ATTLIST x xmlns CDATA "123">
> or
> <!ATTLIST x xmlns CDATA #FIXED "123">
> etc. that an instance with
> <y:x xmlns:y="123">
> is correct.
>
> You would also need the rule that an unprefixed element name
> could only be declared once per DTD, which is not particularly
> objectionable.
>
> Cheers
> Rick Jelliffe
>
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