RE: Astounding silence about same-ness Re: Concept Equivalence, IFPs, skos:subjectIndicator and owl:sameAs

Hello Bernard,

> Hello Stuart
> > Hello Lars (and Bernard)
> >
> > FWIW I'm much happier now that I've spotted the blank node I'd 
> > previously missed in the SKOS Guide example Published Subject 
> > Indicators.
> >   
> To be honest I had missed it also so far. Thanks for pointing at this
> > I would have seen it more quickly with N3 and/or a diagram
> >   
> Sure.  I opened  it with SWOOP just to make sure :-)

:-)

> Anyway, I'm not sure this is exactly an answer to your 
> original question. 

Well, it doesn't directly, though more explainatory narrative might.
IMO it would be better if the domain of skos:subjectIndicator were wider
than skos:Concept - as you point out below a subject can be anything
(kind of thing). However, if one were to think of an blank skos:Concept
acting in the role of a (bnode) subject (tm sense of subject) as
distinct from a local conceptualisation of that subject, I think that,
with care, things can be written to work as intended (that seems a bit
vague - sorry).

Cleaner would be to open up the domain of subjectIndicator (and to leave
it as an IFP).

> You still need in this example the level 
> of indirection we have been speaking about, since the 
> skos:subjectIndicator is directly attached to the blank node, 
> which is therefore a skos:Concept, not to the abstract blank 
> subject represented by this concept.

Yes... 

> The fact that the skos:Concept in this example is represented 
> by a blank node does not change the issue. It's a 
> skos:Concept altogether, and is the same as (owl:sameAs) the 
> "Ornithology" concept of the previous example if 
> skos:subjectIndicatorRef is an IFP.

Yes... but (FWIW) that concept node is also blank (and doesn't have a
nodeID for internal skos:subject references).

[Quoting the example to make sure that we're talking about the same one]
<rdf:RDF
  xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
  xmlns:skos="http://www.w3.org/2004/02/skos/core#">
  
  <skos:Concept>
    <skos:prefLabel>ornithology</skos:prefLabel>
    <skos:subjectIndicator
rdf:resource="http://www.example.com/psi/ornithology.html"/>
  </skos:Concept>

</rdf:RDF>

> 
> Bernard
> 

Best regards

Stuart
--

Received on Monday, 13 November 2006 09:24:21 UTC