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

Re: What to do about namespace derived URI refs... (long)

From: Jonathan Borden <jborden@mediaone.net>
Date: Wed, 6 Jun 2001 11:16:44 -0400
Message-ID: <0a5401c0ee9b$b2908090$0a2e249b@nemc.org>
To: <Patrick.Stickler@nokia.com>, <www-rdf-interest@w3.org>
Cc: <Ora.Lassila@nokia.com>
Ok I see. What is tricky about _that_ problem is that the fragment
identifier syntax is defined by the media type of the MIME message. I have
started to consider these issues: http://www.rddl.org/SchemaAlgebra . There
are some thorny issues here. Consider particularly the fact that XML Schema
uses QNames not URI references to generally identify types, and that a QName
may identify each an element, attribute, complexType etc.

-Jonathan



>
> No, this is still missing the point. Even if I am able
> to use RDDL to retrieve a DTD, an XML Schema, an RDF Schema,
> etc. etc. associated with a namespace, that *still* does
> not address the problem that the abstract information
> resources (e.g. properties, etc.) defined in any of those
> schemas may have varying URI references!
>
> There should be, e.g. for the DC 'Title' property, one consistent
> URI reference that can be used by RDF Schemas to reference it, and
> that URI reference should be the same regardless as to whether
> my system is using a DTD, an XML Schema, or any other schema
> to define well formedness or validity constraints on the serialization
> of data streams for interchange into/out of that system.
>
> I think that RDDL solves a very important problem, but that's not
> the problem I'm talking about here.
>
> Patrick
>
> > -----Original Message-----
> > From: ext Jonathan Borden [mailto:jborden@mediaone.net]
> > Sent: 06 June, 2001 17:25
> > To: Patrick.Stickler@nokia.com; sean@mysterylights.com;
> > www-rdf-interest@w3.org
> > Cc: Ora.Lassila@nokia.com
> > Subject: Re: What to do about namespace derived URI refs... (long)
> >
> >
> >
> > >
> > > The key point here is that (a) we use URNs rather than URLs
> > > to identify namespaces and abstract resources, and (b) we
> > > define the necessary mappings between a standardized URN
> > > scheme and the various schema and serialization schemes
> > > that might reify or reference those abstract resources
> > > within a given system (i.e. XML Schema, RDF, etc.).
> > >
> >
> > The XML-DEV group has been discussing this issue at length. RDDL
> > http://www.rddl.org is suggested as a format to describe
> > namespace related
> > resources such as schemata, CSS etc. A RDDL document may be
> > resolved by a
> > URL, or via a URN using something like the DDDS mechanism:
> > http://www.ietf.org/internet-drafts/draft-ietf-urn-uri-res-ddds-03.txt
> >
> > -Jonathan
> >
>
Received on Wednesday, 6 June 2001 11:33:41 GMT

This archive was generated by hypermail 2.2.0+W3C-0.50 : Monday, 7 December 2009 10:51:49 GMT