Simple cardinality tests with SPARQL

[Jaroslav Pullmann]

 Hello,
to check for property cardinalities within an RDF document I used following 
queries:

 - for cardinality 0-1: NOT(Q2)
 - for cardinality 1: Q1 AND NOT(Q2)
 - for cardinality 1-n : Q1


# Q1
ASK
WHERE
{
    ?s rdf:type pfx:Foo; pfx:bar ?b .
}

# Q2 - no solutions, no duplicates
ASK
WHERE
{
    ?s rdf:type pfx:Foo;
    pfx:bar ?b;
    pfx:bar ?b1
    FILTER(?b != ?b1)
}

Could these queries be formulated in a simpler, more elegant way ?

  Many thanks for your suggestions
    Jaro



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Jaroslav Pullmann
Web Compliance Center - Fraunhofer FIT
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