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   Re: [xml-dev] XPointer and XML Schema

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  • To: xml-dev@lists.xml.org
  • Subject: Re: [xml-dev] XPointer and XML Schema
  • From: ht@cogsci.ed.ac.uk (Henry S. Thompson)
  • Date: 17 Jul 2002 17:30:55 +0100
  • In-reply-to: <f5bit3e8gsj.fsf@cogsci.ed.ac.uk>
  • References: <f5bit3e8gsj.fsf@cogsci.ed.ac.uk>
  • User-agent: Gnus/5.0808 (Gnus v5.8.8) XEmacs/21.4 (Honest Recruiter)

Eric vDv wrote:

> On Wed, 2002-07-17 at 17:57, Henry S. Thompson wrote:
> > "Wayne Steele" <xmlmaster@hotmail.com> writes:
> > > If XPointer is going to depend on XML Schema, it should do so in a
> > > well-specified way.
> > 
> > It doesn't, and the WG thought its non-dependency was already
> > well-specified by the phrase above.  
> Isn't it necessary to introduce a XPointer scheme to identify the (or a)
> schema(s) which should be used to evaluate the bare names then? It's
> done to declare namespaces, why couldn't it be done to declare the
> schemas? Although it wouldn't be concise it would be fully
> "deterministic"!

We could do that, but it would be wrong (in my view).  Wrong because
it violates locality -- a barename link with name XYZZY is to what the
_target_ establishes as is its XYZZY ID, not the source.  Think of how
it works with DTDs, and a complex case with external entities and
catalogues and proxies and . . .  There's nothing I can do at the
source end to determine what the target is going to establish as the
referent under those circumstances.  So I don't think there should be
for the Schema case either.  The _user_ does that by setting up the
processing environment, in either case.

  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
          W3C Fellow 1999--2002, 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/
 [mail really from me _always_ has this .sig -- mail without it is forged spam]


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