Re: [xml-dev] Processing instruction to designate a schema as subset of

[Liam Quin <liam@w3.org>]

On Thu, Aug 27, 2009 at 04:23:36PM +0100, Stephen Green wrote:
> Many thanks Liam; exactly answers my question.
> 
> Apologies about my example using 'xml' in the PI.

No problem, just letting you know ;-)

> Guessing it is unlikely this requirement would get into
> XML Schema, I had figured something independent
> of  the schema would be the most I could hope for,

Hope for the stars, ask for the sun, settle for the moon.

> besides which it might be good to keep it independent of
> schema language anyway.

You can't go putting processing instructions in relaxNG non-XML
syntax schemas, and if you put a processing instruction in
a DTD you generally won't be able to find it again with
XML tools.  Actually processing instructions tend not to
be very robust in any case.

> I'm not keen on defining a
> PI with RDF or a topic map but is this best practice?
No, what I meant was that you'd have an external document that
encapsulated the many-to-many relationships between different
schemas.

See also SML for another example, although I don't know if you 
can use SML to ay that one schema is an extension or a pure
subset of another.

> Anyway, not much hope I could get any traction on this
> as an individual
Don't despair.  W3C at least is about individuals, not about
large companies (e.g. every participating organisation gets
exactly one vote, regardless of how many pepole they send).
And the XML stylesheet PI spec is pretty small.

Best,

Liam

-- 
Liam Quin, W3C XML Activity Lead, http://www.w3.org/People/Quin/
http://www.holoweb.net/~liam/ * http://www.fromoldbooks.org/