Le 07/06/2011 10:22, Michael Hausenblas a écrit :
Something I don't understand. If I read well all savvy discussions so
far, publishers behind http://schema.org URIs are unlikely to ever
provide any RDF description,
What makes you so sure about that not one day in the (near?) future the
Schema.org URIs will serve RDF or JSON, FWIW, additionally to HTML? ;)
Sure and I'm tempted to believe that this will happen eventually.
Nonetheless, Bernard makes a good point: the URIs, such as
http://schema.org/Thing, are information resources, as far as
httpRange14 is concerned. If you guys from the Linked Data Research
Centre are not following httpRange14 resolution, who will?
Anyway, schema.rdfs.org is very good initiative and an excellent answer
to schema.org.
AZ.
Cheers,
Michael
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Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
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Ireland, Europe
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On 7 Jun 2011, at 08:44, Bernard Vatant wrote:
Hi all
Something I don't understand. If I read well all savvy discussions so
far, publishers behind http://schema.org URIs are unlikely to ever
provide any RDF description, so why are those URIs declared as
identifiers of RDFS classes in the http://schema.rdfs.org/all.rdf. For
all I can see, http://schema.org/Person is the URI of an information
resource, not of a class.
So I would rather have expected mirroring of the schema.org URIs by
schema.rdfs.org URIs, the later fully dereferencable proper RDFS
classes expliciting the semantics of the former, while keeping the
reference to the source in some dcterms:source element.
Example, instead of ...
<rdf:Description rdf:about="http://schema.org/Person";>
<rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Class"/>
<rdfs:label xml:lang="en">Person</rdfs:label>
<rdfs:comment xml:lang="en">A person (alive, dead, undead, or
fictional).</rdfs:comment>
<rdfs:subClassOf rdf:resource="http://schema.org/Thing"/>
<rdfs:isDefinedBy rdf:resource="http://schema.org/Person"/>
</rdf:Description>
where I see a clear abuse of rdfs:isDefinedBy, since if you
dereference the said URI, you don't find any explicit RDF definition ...
I would rather have the following
<rdf:Description rdf:about="http://schema.rdfs.org/Person";>
<rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Class"/>
<rdfs:label xml:lang="en">Person</rdfs:label>
<rdfs:comment xml:lang="en">A person (alive, dead, undead, or
fictional).</rdfs:comment>
<rdfs:subClassOf rdf:resource="http://schema.rdfs.org/Thing"/>
<dcterms:source rdf:resource="http://schema.org/Person"/>
</rdf:Description>
To the latter declaration, one could safely add statements like
schema.rdfs:Person rdfs:subClassOf foaf:Person
etc
Or do I miss the point?
Bernard
2011/6/3 Michael Hausenblas <michael.hausenb...@deri.org>
http://schema.rdfs.org
... is now available - we're sorry for the delay ;)
Cheers,
Michael
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html
--
Bernard Vatant
Senior Consultant
Vocabulary & Data Integration
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Mail: bernard.vat...@mondeca.com
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