same as you know if we retrieve the object property or data property and subclass can do that by joining them in one variable :
Query 1
SELECT ?x ?y
WHERE { ?x rdfs:subClassOf ?y.
?x rdf:type owl:ObjectProperty.
}
the x var it's same object property and subclass of other class
im need to join (all individual "NamedIndividual")
with object property or subclass .
the problem that is ( ?x rdf:type owl:NamedIndividual . )
couldn't use "?x" in any other location same as :
?x rdfs:subClassOf ?y.
Query 2
SELECT ?x ?y
WHERE { ?x rdfs:subClassOf ?y.
?x rdf:type owl:NamedIndividual .
}
Query 3
SELECT ?x ?y
WHERE { ?x rdf:type owl:ObjectProperty.
?x rdf:type owl:NamedIndividual .
}
So: Query 2 and Query 3 cannot be implemented.
how I can solve this problem?
If I can remember.
To get x that is a subclass of y.
SELECT ?x ?y
WHERE { ?x rdfs:subClassOf ?y.
?x rdf:type owl:Class. ## or rdfs:Class??
}
To get object property of ?x
SELECT ?x ?y ?p ?q
WHERE { ?x rdfs:subClassOf ?y.
?x ?p ?q.
?p rdf:type owl:ObjectProperty.
}
Sometimes, we don't have to specify every constraint. For example, the above. You don't have to specify ?x rdf:type owl:Class ...because it exists already with subclass property.
I don't know this helps you or not. I don't use SPARQL for many years.
Best wishes.
Hi.,
A policy is a set of assertions (rules, requirements, obligations) that express specific policy requirements or properties of a Web service. A policy assertion is a basic unit representing an individual requirement, capability or property in a policy. Assertions use domain-specific semantics to enable interoperability.
The SQL statement creates an assertion to demand that there's no more than a single president ... or Portland from supplying, in quantities higher than 50, all the parts that ... when a transaction changes involved data ..
The question is not clear to me.
Are you looking for having a single variable bound in different patterns? Have you considered using the UNION operator to get a disjunction of graph patterns?
See examples in https://en.wikibooks.org/wiki/SPARQL/UNION
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