Re: DTDs schemas and validation WAS RE: DTD Files !

[ht at cogsci dot ed dot ac dot uk (Henry S. Thompson)]

MarkH@i2.co.uk writes:

> I'm looking at the thorny issue of validation and what seems to be a
> watershed in approaches between content-free DTDs which allow Mike to take
> approach he likes, and content-including schemas, which by virtue of their
> including things like default elements or attribute values, can prevent Mike
> from reading content without also reading and using the validating schema.
> 
> I'm reviewing the state of play and then hope to open up a debate. I think
> that it will be appropriate for this list because of the point that Mike
> raises about doing validation within XSLT.

Good idea.  I'd note that XML Schema, by design, does not suffer from
a number of the problems which Mike identified.  In particular, the
schema (or lack of schema) to be used for schema-validation can be
chosen at processing time, it's not rigidly determined by the
document.

The defaulting issue remains, however.

ht
-- 
  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
          W3C Fellow 1999--2001, part-time member of W3C Team
     2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
	    Fax: (44) 131 650-4587, e-mail: ht@cogsci.ed.ac.uk
		     URL: http://www.ltg.ed.ac.uk/~ht/


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