W3C home > Mailing lists > Public > public-rdf-wg@w3.org > March 2012

Re: Use cases wrt Dataset proposal (UC 1.5, UC 5.2)

From: Antoine Zimmermann <antoine.zimmermann@emse.fr>
Date: Thu, 01 Mar 2012 09:50:26 +0100
Message-ID: <4F4F3852.1030800@emse.fr>
To: Dan Brickley <danbri@danbri.org>
CC: Pat Hayes <phayes@ihmc.us>, RDF WG <public-rdf-wg@w3.org>
Le 01/03/2012 08:48, Dan Brickley a écrit :
>
>
> On Wednesday, 29 February 2012, Antoine Zimmermann wrote:
>
> [...]
>
> If I say in an ontology document:
>
> <>  owl:imports <http://zimmer.aprilfoolsreview.com/antoine#me>.
>
> then, what I get, according to the OWL specs, is an ontology with
> the content of http://zimmer.aprilfoolsreview.com/antoine included,
> in spite of <http://zimmer.aprilfoolsreview.com/antoine#me> denoting
> a foaf:Person.
>
> Please take a look at the OWL 2 spec section 3.2 to check.
>
>
> Why should an ontology's RDF description not include information
> about real-world entities?

On the contrary, it should. It is not what I said. I say that the import 
mechanism does not care about what kind of entity is denoted by the IRI 
used with owl:imports. In the example above, the owl:imports statement 
implies (in the OWL 2 RDF based semantics, which is certainly the one 
the RDF WG is most interested in) that 
<http://zimmer.aprilfoolsreview.com/antoine#me> is an ontology, but 
after the import is effective via a HTTP lookup, it will be inferred 
that <http://zimmer.aprilfoolsreview.com/antoine#me> is a foaf:Person as 
well. This is consistent, as nothing says that ontologies cannot be 
people, but it may seem weird to some people. But look at the following 
example:


<> owl:imports <http://xmlns.com/foaf/0.1/#stuff> .
<http://xmlns.com/foaf/0.1/#stuff> owl:sameAs 
<http://dbpedia.org/ontology/> .

This will import the FOAF ontology (assuming the application is doing a 
HTTP lookup). However, this:

<> owl:imports <http://dbpedia.org/ontology/> .
<http://xmlns.com/foaf/0.1/#stuff> owl:sameAs 
<http://xmlns.com/foaf/0.1/#stuff> .

will import the dbpedia ontology.

In spite of owl:sameAs being formally interpreted as identity, these two 
ontologies will eventually have very different inferences. This is 
because the mechanics behind owl:imports is not part of the model theory 
of OWL.

>
> Dan
>
>
>
>
> At the very least, if we mandate this, then we need to clarify the
> semantic role of "label" URIs in datasets.
>
> Pat
>
> ------------------------------__------------------------------ IHMC
> (850)434 8903 or (650)494 3973 40 South Alcaniz St. (850)202 4416
> office Pensacola                            (850)202 4440   fax FL
> 32502                              (850)291 0667 mobile
> phayesAT-SIGNihmc.us http://www.ihmc.us/users/__phayes
> <http://www.ihmc.us/users/phayes>
>
>
>
>
>
>
>
> -- Antoine Zimmermann ISCOD / LSTI - Institut Henri Fayol École
> Nationale Supérieure des Mines de Saint-Étienne 158 cours Fauriel
> 42023 Saint-Étienne Cedex 2 France Tél:+33(0)4 77 42 83 36
> Fax:+33(0)4 77 42 66 66 http://zimmer.__aprilfoolsreview.com/
> <http://zimmer.aprilfoolsreview.com/>
>


-- 
Antoine Zimmermann
ISCOD / LSTI - Institut Henri Fayol
École Nationale Supérieure des Mines de Saint-Étienne
158 cours Fauriel
42023 Saint-Étienne Cedex 2
France
Tél:+33(0)4 77 42 83 36
Fax:+33(0)4 77 42 66 66
http://zimmer.aprilfoolsreview.com/
Received on Thursday, 1 March 2012 08:50:54 GMT

This archive was generated by hypermail 2.3.1 : Tuesday, 26 March 2013 16:25:47 GMT