Jaroslav Pullmann wrote:
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 .
}
you want to check cardinality 1-n of the bar propery on class Foo, I
assume... looks fine, could syntactically be abbreviated a bit using
turtle shortcuts:
ASK WHERE { [a 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)
}
also looks reasonable to me, you could do a positive version, by "hifing
the NOT in an OPTIONAL as usual:
ASK
WHERE
{
OPTIONAL{ [a pfx:Foo ] pfx:bar ?b, ?b1 . FILTER(?b != ?b1) }
FILTER( ! bound (?b ) )
}
Could these queries be formulated in a simpler, more elegant way ?
Many thanks for your suggestions
Jaro
--
Dr. Axel Polleres
Digital Enterprise Research Institute, National University of Ireland,
Galway
email: [EMAIL PROTECTED] url: http://www.polleres.net/
