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Re: Schema.org in RDF ...

From: Bernard Vatant <bernard.vatant@mondeca.com>
Date: Tue, 7 Jun 2011 10:39:05 +0200
Message-ID: <BANLkTikCNjhYnFkFSvxXzU3QRtHc5HScVg@mail.gmail.com>
To: Michael Hausenblas <michael.hausenblas@deri.org>
Cc: Linked Data community <public-lod@w3.org>
Hi Michael

I just repeated what some people-who-know-better around assumed  ...
For myself I'm sure of nothing, in particular regarding the future :)
And that's exactly why seems to me that assertions published today should
not preempt (possible) semantics of tomorrow, but rely on semantics as they
stand : http://schema.org/Person is an information resource, not a
rdfs:Class.

In the solution I propose, whenever the event you expect happens, just add
owl:equivalentClass and owl:equivalentProperty to your descriptions.
If it does not happen as you wish, nothing is broken. If people at
schema.org change their mind and throw away everything, you get rid of the
dcterms:source and your descriptions stay alive and backward compatible for
people in the RDF world. Et voilà.

Bernard

2011/6/7 Michael Hausenblas <michael.hausenblas@deri.org>

> 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? ;)
>
>
> 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
>
> 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.hausenblas@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
>> Tel:       +33 (0) 971 488 459
>> Mail:     bernard.vatant@mondeca.com
>> ----------------------------------------------------
>> Mondeca
>> 3, cité Nollez 75018 Paris France
>> Web:    http://www.mondeca.com
>> Blog:    http://mondeca.wordpress.com
>> ----------------------------------------------------
>>
>
>


-- 
Bernard Vatant
Senior Consultant
Vocabulary & Data Integration
Tel:       +33 (0) 971 488 459
Mail:     bernard.vatant@mondeca.com
----------------------------------------------------
Mondeca
3, cité Nollez 75018 Paris France
Web:    http://www.mondeca.com
Blog:    http://mondeca.wordpress.com
----------------------------------------------------
Received on Tuesday, 7 June 2011 08:39:34 UTC

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