Re: SDW plenary agenda item - Namespace for SOSA and SSN ontology

Dear Raphaël,


> > A term would be defined in at most one ontology, CORE or FULL.
> > Potentially, if this ontology is CORE, this term will be further
> > axiomatized (not defined), in the ontology FULL.
>
> This means that a concept (e.g. Platform) could be simply defined in the
> CORE ontology:
>
> sosa:Platform a rdfs:Class, owl:Class .
>
> and further axiomitized in the FULL ontology:
>
> sosa:Platform rdfs:subClassOf [
>    rdf:type owl:Restriction ;
>    owl:onProperty sosa:inDeployment ;
>    owl:allValuesFrom sosa:Deployment ]
>
> > So to answer your question, looking up
> > URI http://www.w3.org/ns/unify/TermInBothOntologies would redirect you
> > to CORE ontology if it is defined  in CORE.
>
> So, http://www.w3.org/ns/sosa/Platform enables me to get the statement I
> can find in CORE ontology (i.e. the single statement telling me that
> this is rdfs:Class). How can I get the other statements (the restriction)?
>

This is an interesting point and can be discussed further, but currently,
the choice is to redirect to the *simplest ontology* where there exists
some axioms about xxx:yyy.

We cannot just rely on Linked Data principles here, and are forced to do it
manually or to rely on the OWL imports mechanism.

As the publisher of some RDF Graph that contains SSN instance data, you can
encourage your consumers to use the FULL semantics by adding the following
two triples to your RDF graph:

[] a owl:Ontology ; owl:imports FULL .

As the consumer of some RDF Graph that contains SSN instance data and no
"import" statement, you must choose which ontology you want to load, CORE
or FULL.

If you usually look up the URI of some term to discover its associated
semantics, then you might only discover the set of statements  that exist
in CORE.

If you usually look up some namespace URI declared in the Turtle or RDF/XML
document you consume, then.... question mark .... we did not yet discuss
where the raw namespace URI should redirect to.

If you think of any other problem, question, or potential solution that
could fuel the discussion, please don't hesitate !

Kind regards,
Maxime


>
>    Raphaël
>
> --
> Raphaël Troncy
> EURECOM, Campus SophiaTech
> Data Science Department
> 450 route des Chappes, 06410 Biot, France.
> e-mail: raphael.troncy@eurecom.fr & raphael.troncy@gmail.com
> Tel: +33 (0)4 - 9300 8242 <04%2093%2000%2082%2042>
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>