To get all instances ?a of a given class $class, the pattern is
SELECT DISTINCT ?a
WHERE {
?type rdfs:subClassOf* $class .
?a rdf:type ?type .
}
It is not clear to me whether you are looking for instances of a class, or
classes that are instances of a metaclass, or maybe you can clarify in prose
what you mean?
(Also: c? looks incorrect but I guess that was a copy-and-paste problem).
Holger
> On 26 Apr 2023, at 4:52 pm, Julia S. <[email protected]> wrote:
>
> Hi,
> I am trying to customize a SWP script for the first time (7.2.4) and I am
> struggling a little bit.
>
> We have an existing script that does almost exactly what I want based on this:
>
> SELECT DISTINCT ?a ?b ?c
> WHERE { ?a ?b c?.
> ?b a <URI_of_class> .
> }.
>
> So a function is called if ?b is a specific class (specified by it's URI)
>
> I wanted to change this so it uses that class' children instead of the class
> itself and found rdfs:subClassOf.
>
> I tried the following versions, none of which work.
>
> A)
> SELECT DISTINCT ?a ?b ?c
> WHERE { ?a ?b c?.
> ?b rdfs:subClassOf <URI_of_class> .
> }.
>
> B)
> SELECT DISTINCT ?a ?b ?c
> WHERE { ?a ?b c?.
> ?b (rdfs:subClassOf)* <URI_of_class> .
> }.
>
> C)
> SELECT DISTINCT ?a ?b ?c
> WHERE { ?a ?b c?.
> ?b (rdfs:subClassOf)+ <URI_of_class> .
> }.
>
> I double checked if rdfs:subClassOf (including * and +) works on its own
> using a SPARQL endpoint and it gives me the expected instances.
>
> I am guessing I still simply use the wrong syntax for swp scripts or don't
> understand what rdfs:subClassOf actually means.
>
> Any advice?
>
> Cheers
> Julia
>
>
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