xml-dev - Re: DTD vs Schema

[Peter Murray-Rust <peter@ursus.demon.co.uk>]

At 09:33 10/09/98 -0400, David Megginson wrote:
>I still haven't had time to give XSchema a proper going-over, but from
>what I've seen, XSchema and DCD are not competing for the same
>territory:
>
>- XSchema defines an instance-based representation of DTDs

This is certainly my understanding - in the virtual group we have been very
careful to restrict ourselves to current DTD functionality. The intention
is that dtd2xsc is essentially lossless *after* normalisation of PEs,
inclusion of entity files, etc. xsc2dtd would lose the non-DTD information.
XSchema will allow DTD information to be managed with XML technology (e.g.
edited, printed nicely, etc.) I - and I suspect others - will see it as a
way to create DTD-aware authoring tools.
 However, XSchema is in XML and therefore eXtensible :-) What value people
put on that is up to them :-)  

>- DCD defines an alternative to DTDs

Yes. Exciting new territory. In my mind XSchema may be a transition towards
this.

	P.

>
>Does this make sense?
>
>
>All the best,
>
>
>David
>
>-- 
>David Megginson                 david@megginson.com
>           http://www.megginson.com/
>
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Peter Murray-Rust, Director Virtual School of Molecular Sciences, domestic
net connection
VSMS http://www.nottingham.ac.uk/vsms, Virtual Hyperglossary
http://www.venus.co.uk/vhg

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