Ninus; Both of these queries can be accomplished with Aggregates,
which are included in the SPARQL 1.1 working draft and have been
supported by Composer for a while.
There are probably a few ways to do the first one. I'll use
aggregates along with turning rdfs:subClassOf into a transitive
relationship ('+' and '*" syntax).
SELECT count(?inst)
WHERE {
?cls rdfs:subClassOf+ owl:Thing .
?inst a ?cls .
}
If you need to bind the count to a variable, then use SELECT (count(?
inst) AS ?x).
The second can be performed with a simple aggregate. Note that SPARQL
is RDF-based. It does not entail any OWL or RDFS semantics, so you
can match the triple pattern directly.
SELECT count(*)
WHERE {
?x :Prop ?z .
}
-- Scott
On Oct 30, 4:35 pm, Nick Khamis <[email protected]> wrote:
> Hello everyone. I am looking for a couple of Sparql Queries... Assume the
> following:
>
> Concept: A, B
> Property: p
> Individuals: x, y, z
>
> A(x)
> A(y)
> B(z)
> p(A,B)
> p(x,z)
>
> Basically what I am looking for are the following:
>
> * When opening up an ontology using TBC we get a number of individuals that
> are of type something that is a subclass of owl:thing. What would a sparql
> query look like that would return the number of individuals that are of type
> owl:Thing that of course has subclasses that the individuals are direct
> types of.
>
> * A query that returns the number of created relationships "not number of
> object and datatype properties". I am talking about "p(x,z)". Since the
> domain for p is A which x and y are individuals of, but a relationship is
> created only for x using the property p then the query should return 1 for
> the p(x,y) relationship.
>
> Thanks in Advanced,
> Ninus.
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