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Subject: RE: [ubl-cmsc] Schema Derivation -- Do We Need It?


Title: RE: [ubl-cmsc] Schema Derivation -- Do We Need It?

Matt:

I am in general agreement that derivation should be expressed in schema, for the reasons you express. Commerce One is an example of a company whose technology *does* leverage extensions expressed in schema for reasons similar to what you have outlined here, so I don't think this is entirely a futures discussion, but I agree that this will either become a standard use of XML or it won't. I also think that it will.

A point of correction: it turns out that RELAXNG has a way of self-extending which allow you to include an extension mechanism. We should ask Eduardo further about this, as he has looked into it more than I have, but from what I understand it *is* possible to have RELAXNG extensions. We might even want to look into the ability of extending a schema language as a way to get all the functionality we need. RELAXNG might support this. (Radical idea, eh?)

Cheers,

Arofan

-----Original Message-----
From: Matthew Gertner [mailto:matthew.gertner@schemantix.com]
Sent: Tuesday, December 11, 2001 12:39 PM
To: UBL CMSC Listserv (E-mail)
Subject: [ubl-cmsc] Schema Derivation -- Do We Need It?


I am attaching a discussion document that I have written in the hope of
sparking some discussion on one of the topics raised during our call last
week: do we actually need to use the derivation features of schema languages
like XSD when creating new types through the application of context. I have
modestly called it version 0.1, since I think it could probably use a lot
more discussion, work and fine-tuning. It is probably a decent start to the
discussion, however.

At this point I am primarily interested in knowing whether *anyone* out
there is with me on this. Am I a kook for believing that XML schema-driven
software development will be a popular practice in the future? Any and all
comments would therefore be most appreciated.

If there is some agreement that this is a valid issue and approach to the
problem, I have in mind some forums (like the XML-Dev mailing list) where we
could post a later version of this paper to get more valuable input from
technical experts who are not participating directly in UBL.

Cheers,
Matt

PS: Many apologies for sending out a Word document. I'll make a PDF version
tomorrow and send it to the list.



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