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

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

From: Sean B. Palmer <sean@mysterylights.com>
Date: Wed, 6 Jun 2001 18:06:34 +0100
Message-ID: <025601c0eeab$29b7bee0$60dd93c3@z5n9x1>
To: <jborden@mediaone.net>, <Patrick.Stickler@nokia.com>, <www-rdf-interest@w3.org>
Cc: <Ora.Lassila@nokia.com>
> If I e.g. want to use XML Schema to provide strict
> data typing for my serialized RDF instances (e.g. strict
> date formats, enumerations of token value sets such as
> ISO language names, etc.) I need to be sure that both XML
> Schema and RDF Schema are using the same URIs to talk about
> the same things.

Agreed, and this is a problem for most specifications of this nature,
but not XML Schema in particular, because we can be very sure what URI
to use for any particular concept. As long as we are careful to ensure
that we only use the URI References in RDF applications, and the
namespace sans "#" for XSD processors, then we have no need to worry.
As for other specifications, Jon's schema algebra is a good thing to
look at.

DAML is a bit mixed up, seeing as how it uses the XSD namespace sans
hash to create RDF datatypes. The way we did it with EARL (after some
prodding from Dan and Aaron!) was to define our new datatypes as
explicit URIs that are a DAML union of the URIs set out in the XSD
specification. As EARL is an RDF application, there is no problem in
doing that. Had it been an XSD application, we would have done it in
the usual XSD in XML manner.

Kindest Regards,
Sean B. Palmer
@prefix : <http://webns.net/roughterms/> .
:Sean :hasHomepage <http://purl.org/net/sbp/> .
Received on Wednesday, 6 June 2001 13:06:13 UTC

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