A Plea for Schemas

Liam R. E. Quin liamquin at interlog.com
Mon Nov 1 19:45:24 GMT 1999

On Tue, 2 Nov 1999, Rick Jelliffe wrote:
> We need the equivalent of the XML Stylesheet declaration (PI) so that
> alternative schemas can be available  (perhaps with one being the
> canonical schema) and so that use of a document is not dependent on
> buying into a particular schema language.

If you want every XML system to understand a schema, then you need
a different model.  You need a single VERY simple core schema language
that all XML 1.2 (say) validating processors are *required* to understand,
and make it extensible.

Otherwise one person will use SQL, another tcl, another LISP s-exprs,
another PROLOG Horn Clauses, and there will be no interoperability.

And XML is all about inteoperability.

The XML Stylesheet declaration, by the way, should have been done with
XLink.  The fact that an XML document does not use the XML linking
mechanism for links to its DTD and components indicates a problem.

In our case, the problem is that XLink wasnt invented, of course.


Liam Quin, Barefoot Computing, Toronto;  The barefoot agitator
l i a m q u i n     at    i n t e r l o g    dot   c o m
Ankh on irc.sorcery.net

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