If I've understood correctly http://schema.org/Person does not in any
way equal or equiv to foaf:person
Surely:
?foo a <http://schema.org/Person> .
is actually saying
?foo foaf:primary_topic ?person .
?person a foaf:Person .
I've said before that there's value in predicates which relate the
primary topic of X to the primary topic of Y, as that's what people want
to do in RDFa. When converting into more reasonable (pun intended)
predicates, this level of indirection should be recognised.
foaf:interest already as a domain which is the page, not the URI itself.
http://xmlns.com/foaf/spec/#term_interest -- I'm not keen on mixing them
in one scheme -- it'll confuse people, but let people relate things
together using their URLs and make the semantics describe that honestly.
Bernard Vatant wrote:
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 <http://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.hausenb...@deri.org
<mailto:michael.hausenb...@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
<http://schema.org> URIs by schema.rdfs.org
<http://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
<mailto: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
Tel: +33 (0) 971 488 459
Mail: bernard.vat...@mondeca.com
<mailto:bernard.vat...@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.vat...@mondeca.com <mailto:bernard.vat...@mondeca.com>
----------------------------------------------------
Mondeca
3, cité Nollez 75018 Paris France
Web: http://www.mondeca.com
Blog: http://mondeca.wordpress.com
----------------------------------------------------
--
Christopher Gutteridge -- http://id.ecs.soton.ac.uk/person/1248
You should read the ECS Web Team blog: http://blogs.ecs.soton.ac.uk/webteam/
