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RE: procedure for determining reserved vocab

From: Jeremy Carroll <jjc@hplb.hpl.hp.com>
Date: Mon, 1 Jul 2002 10:13:07 +0100
To: "R.V.Guha" <guha@guha.com>, <w3c-rdfcore-wg@w3.org>
Message-ID: <JAEBJCLMIFLKLOJGMELDMEDGCEAA.jjc@hplb.hpl.hp.com>

> (2) We use normal http uris and embed this somewhere in the middle of
> the uri. eg., http://www.w3.org/reserved/cwm#implies or
> http://www.w3.org/reserved/http://oasis.org/cwm#implies.


At the telecon on Friday this was the preferred option, or rather using a
special prefix.

e.g.

http://myuri


maps to

http://www.w3.org/reserved/http://myuri

There was discussion that this does not involve a central registry because the
whole of URI space can be embedded under http://www.w3.org/reserved/ (I made
comments about Hilbert's hotel).

Other made comments which I may describe as Hilbert's web-server.

We put a smart on the W3C webserver such that

http://www.w3.org/reserved/SOME-URI

has a redirect to SOME-URI.

This would then give an operational semantics to embedding the whole of the
light web within the dark web.

I wished to point out a bug with this redirect.

Consider an RDF resource like
http://www.w3.org/2000/01/rdf-schema#label

and its dark variant

http://www.w3.org/reserved/http://www.w3.org/2000/01/rdf-schema#label


getting either of these documents and applying the usual rules will result in
getting

<rdf:Property ID="label">
 <rdf:type resource="http://www.w3.org/1999/02/22-rdf-syntax-ns#Property"/>
 <rdfs:label xml:lang="en">label</rdfs:label>
 <rdfs:label xml:lang="fr">label</rdfs:label>
 <rdfs:domain rdf:resource="#Resource"/>
 <rdfs:comment>Provides a human-readable version of a resource
name.</rdfs:comment>
 <rdfs:range rdf:resource="#Literal"/>
</rdf:Property>

as the definition of either resource.
In the first case (the light case, intended by the document author), the base is
http://www.w3.org/2000/01/rdf-schema

In the second case (the dark case, not intended by the author) the base is
http://www.w3.org/reserved/http://www.w3.org/2000/01/rdf-schema

The problem is that the author has unwittingly created dark properties as well
as light properties.


This problem does not happen if:
- we always use N-triple and not RDF/XML
- we always use xml:base
- we always use rdf:about and not rdf:ID in schemas


Since any of these is a major change I am less than convinced by Hilbert's web
server.

Jeremy
Received on Monday, 1 July 2002 05:13:38 EDT

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