[foaf-dev] Time to make the foaf classes relate to Dublin Core classes?

[Mikael Nilsson]

On ons, 2008-01-23 at 12:24 +0000, Richard Cyganiak wrote:
> Dan,

> After all, it is clear and undeniable that the FOAF specification is a  
> creative work of yours. It is also undeniable that this specification  
> describes a class, foaf:Person, which contains all people. But do you  
> really want to claim that you are the creator of the class of all  
> people?
> 

While I don't deny the need for metadata about the produced documents, I
tend to agree with Dan here. RDF Model Theory [1] makes a clear and
explicit distinction between the class and the set it represents, the
"extension" of the class - they are two different entities. 

This is relevant in many practical contexts and is reflected in the very
existence of owl:equivalentClass (why does this property exist if not
because of the above?).

For example, DCMI did not define the set of Library of congress Subject
headings - but it did define the class dcterms:LCSH to refer to them,
and I believe it is useful to keep that distinction.

/Mikael



[1] http://www.w3.org/TR/rdf-mt/#technote
> 
> 
> > But reciprocal subclass claims, or other OWL statements to same  
> > effect, would be fine. I've talked a few times with Tom about  
> > signing of RDF statement for this sort of thing, but for now I'll  
> > just add this to the next rev of the FOAF spec, unless anyone can  
> > come up with a counter-example.
> >
> > cheers,
> >
> > Dan
> >
> >> /Mikael
> >>
> >> [0] http://dublincore.org/news/2008/#dcmi-news-20080114-01
> >> [1] http://dublincore.org/documents/dcmi-terms/
> >> [2] http://dublincore.org/schemas/rdfs/
> >> [3] http://dublincore.org/documents/domain-range/
> >>
> >> -- 
> >> <mikael at nilsson.name>
> >>
> >> Plus ça change, plus c'est la même chose
> >>
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-- 
<mikael at nilsson.name>

Plus ça change, plus c'est la même chose