The devil is in the “may”

Technically it can be used broader but by convention/best-practise the “may” 
seems actually...”is typically only used for referencing to whole vocabs...”






Dr. ir. H.M. (Michel) Böhms
Senior Data Scientist


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Van: [email protected] <[email protected]> Namens 
Jan Voskuil
Verzonden: Monday, December 2, 2019 8:49 AM
Aan: TopBraid Suite Users <[email protected]>
Onderwerp: Re: [topbraid-users] isDefinedBy usage

The spec is very clear: "This property may be used to indicate an RDF 
vocabulary in which a resource is described."
If it is of any use: at KOOP, I use examples of rdfs:isDefinedBy to explain the 
notions of baseURI, owl:Ontology and namespace. URIs are "minted" in the graph 
where the corresponding resources are defined with a rdfs:isDefinedBy-statement 
with the graph as value. Next, the URIs can be reused elsewhere. 
Pseudo-authorative examples include rdfs, skos, dcterms, void and many, many 
others. -j

On Friday, November 29, 2019 at 3:05:22 PM UTC+1, Irene Polikoff wrote:
This is correct. If one looks at the spec defining this property, it says 
"indicates the resource defining the subject resource. As with rdfs:seeAlso, 
this property can be applied to any instance of rdfs:Resource and may have as 
its value any rdfs:Resource."

However, it is also true that by convention this property is used to identify a 
graph that defines a given resource. I also have not seen it used in any other 
way. One could say that the de facto practice gave this property a more 
limited/targeted semantic than stated in the spec.  It then becomes a matter of 
judgement whether to use it in a way that is different from this convention.


On Nov 29, 2019, at 8:38 AM, dprice <[email protected]<javascript:>> wrote:

Either end of isDefinedBy can be whatever you want. When used in OWL it’s 
annotation property so reasons, etc. ignore it.

Cheers,
David

On 29 Nov 2019, at 08:56, 'Bohms, H.M. (Michel)' via TopBraid Suite Users 
<[email protected]<javascript:>> wrote:


Could rdfs:isDefinedBy also have a single defined class/property as target for 
a subject?

Technically is seems ok (rdfs:resource range) but I see only uses where the 
target is a complete ontology...

Thx Michel





Dr. ir. H.M. (Michel) Böhms
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