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- From: spreitze@parc.xerox.com
- To: "Rick Jelliffe" <ricko@allette.com.au>
- Date: Mon, 8 Feb 1999 10:03:30 PST
> HyTime lets you label edges too... The
> question is, should such labelling be part of the language at the
> lexical level (which XML deals with) or a further layer.
The nature of XML instances is fairly fixed now; the nature of XML schemas is being designed as we speak. I willing to conceive of an XML schema language that can express schemas against a higher-level data model, plus a mapping of that data model into XML instances.
> It is the old
> tradeoff that a general purpose system will (probably) be worse at any
> specific task than a specific system.
I didn't think we were debating whether XML instances or schemas will be general purpose --- of course they will! That's beside the point of what level(s) of abstraction and representation will be addressed by those formalisms.
> But Mike's comments do betray a wish that XML operated on
> some other level than the strictly lexical: but it doesn't, except by
> chance.
I think I've heard a number of people use the term "XML" to describe a data model independent of textual expression (and others tell them they're wrong). It's the richness of that data model (and/or its textual expressions) that I'm addressing. We've already lost the battle for XML instances; for schemas, the outcome is as yet undetermined.
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