W3C home > Mailing lists > Public > www-rdf-interest@w3.org > February 2001

Re: does RDF require understanding all 82 URI schemes?

From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
Date: 12 Feb 2001 08:27:13 +0000
To: "Sean B. Palmer" <sean@mysterylights.com>
Cc: "Jonathan Borden" <jborden@mediaone.net>, "Dave Beckett" <dave.beckett@bristol.ac.uk>, "David Megginson" <david@megginson.com>, <www-rdf-interest@w3.org>, <xmlschema-dev@w3.org>
Message-ID: <f5br914z4pq.fsf@cogsci.ed.ac.uk>
"Sean B. Palmer" <sean@mysterylights.com> writes:

> > Of course the problem with using this URI for XML Schema is
> > that the URI XML Schema specifies is:
> > http://www.w3.org/2000/10/XMLSchema .
> 
> But aren't http://www.w3.org/2000/10/XMLSchema and
> http://www.w3.org/2000/10/XMLSchema# completely equivalent when it comes to
> using them for XML Schema processing?

Of course not.  The namespace URI for the current version of XML
Schema is http://www.w3.org/2000/10/XMLSchema, and that's the _only_
namespace URI it has.  Adding a # on the end produces a namespace URI
which does not compare equal character for character, so is in
principle, for purposes of namespace recognition, as different as
'mailto:/dev/null'.

> *Rule*: A namespace is any URI allowable in the XML Names specification.

Indeed, the one with a # on the end is a perfectly good namespace URI, 
it's just not _the_ namespace URI for XML Schema, and documents with
that as their namespace will _not_ be recognised _by XML Schema-aware
processors_ as defined in the XML Schema spec. as being XML Schemas.

ht
-- 
  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
          W3C Fellow 1999--2001, 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/
Received on Monday, 12 February 2001 03:27:28 GMT

This archive was generated by hypermail 2.2.0+W3C-0.50 : Monday, 7 December 2009 10:51:47 GMT