I will answer this question from two perspectives:
1. Standards
2. TopBraid EDG
1. From the standards perspective, rdfs:isDefinedBy is a utility property that
has no standard semantics.
It is typically used to connect a resource to its “home” vocabulary (a graph).
This is the use case specifically mentioned by the RDFS specification and this
is how it is typically used in practice.
Not having standard semantics means that users are generally free to use it in
any way they want - with an understanding that there is no standard treatment
of it by tools. A tool could decide to do something special when they see this
property - or not. Most (all?) tools don’t.
Thus, if your intended semantics (meaning) is that the object of a triple with
rdfs:isDefinedBy predicate carries a label and a definition for the subject of
that triple, it is up to you to implement software that will understand this
semantics and will act on it. You can’t expect that a standards compliant tools
will understand this.
2. How TopBraid EDG will treat this information
As per above, by default, TopBraid EDG will simply treat a triple with
rdfs:isDefinedBy predicate the same ass any other triple. It will not mean
anything special to EDG - unless you tell EDG that it has a special meaning.
You can define inference rules to give rdfs:isDefinedBy a special meaning. For
example, the property value rule below will automatically infer skos:definition
for sml:Activity from sml-term:Activity.
Or, more generally, for any class from any concept connected to it by
rdfs:isDefinedBy.
owl:Class
sh:property owl:Class-definition ;
sh:property owl:Class-isDefinedBy ;
.
owl:Class-isDefinedBy
a sh:PropertyShape ;
sh:path rdfs:isDefinedBy ;
sh:class skos:Concept ;
owl:Class-definition
a sh:PropertyShape ;
sh:path skos:definition ;
sh:values [
sh:path skos:definition ;
sh:nodes [
sh:path rdfs:isDefinedBy ;
] ;
] ;
.
Note: You can do this for any property except for the
rdfs:label/skos:prefLabel. EDG uses special indexing and algorithms for these
labels and their values need to be asserted directly for each resource.
> On Jun 29, 2021, at 3:46 AM, 'Bohms, H.M. (Michel)' via TopBraid Suite Users
> <[email protected]> wrote:
>
> Dear All,
>
> We use the pattern:
>
>
>
> sml-term:Activity
>
> a skos:Concept ;
>
> skos:broader sml-term:Entity ;
>
> skos:definition "An activity is something possibly or actually happening in
> space and time"@en ;
>
> skos:prefLabel "Activity"@en ;
>
> .
>
>
>
> sml:Activity
>
> a rdfs:Class ;
>
> rdfs:isDefinedBy sml-term:Activity ;
>
> rdfs:subClassOf sml:Entity ;
>
> .
>
>
> But this means that the label is only indirectly available for sml:Activity
> (via “isDefinedBy.prefLabel”)
>
> Is this an issue? (many tools like to have a direct label for their classes)
> Better solutions?
> (I’d like to define only once, not double; label feels naturally close to
> definition; maybe only prefLabel to rdfs-variant and leave
> altLabel/definition at skos?)
>
> Thx for advice,
> Michel
>
>
> Dr. ir. H.M. (Michel) Bohms
> Scientist Specialist
> Structural Reliability
> T +31 (0)88 866 31 07
> M +31 (0)63 038 12 20
> E [email protected] <mailto:[email protected]>
> Location <http://www.tno.nl/locations/DTS>
>
>
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