W3C home > Mailing lists > Public > semantic-web@w3.org > October 2007

Re: URI Equivalence?

From: Renato Golin <renato@ebi.ac.uk>
Date: Tue, 02 Oct 2007 16:30:31 +0100
Message-ID: <47026417.6080404@ebi.ac.uk>
To: semantic-web@w3.org

Tony Hammond wrote:
> I'm curious what can be said in RDF terms re comparing two URIs. For
> example, if I have two graphs
> 
>     G1: { ns:s ns:p ns:o }
>     G2: { ns:s ns:p ns:o }
> 
> then what can be said about reconciling the two subjects? Under what
> conditions is <ns:s> from G1 identical to <ns:s> from G2, i.e.
> referring to the same resource. (I'm assuming full URI normalization
> here, i.e. that the two RDF URI references compare equal, character by
> character, as Unicode strings.)

Hi Tony,

I think that DNS authorities won't matter in this case as long as the
URI are the same after all expansions (prefix). I can state anything I
want about http://www.amazon.co.uk/some-book even if I'm not the domain
authority.

In the case of file://A and http://your.site/B it's clearly not the same
thing unless you state explicitly in your RDF (or import some that does)
that A rdf:sameAs B and search for this relationship in your program.

cheers,
--renato

-- 
Reclaim your digital rights, eliminate DRM, learn more at
http://www.defectivebydesign.org/what_is_drm
Received on Tuesday, 2 October 2007 15:32:43 GMT

This archive was generated by hypermail 2.3.1 : Tuesday, 26 March 2013 21:45:18 GMT