Hi,
Firstly, I'm having trouble finding any *full* examples of SPARQL 1.1
queries that FILTER on "NOT IN". I also cannot find any documentation
on the ARQ engine support for "NOT IN", or indeed the fuseki support
for "NOT IN". Could someone point me to various canonical examples of
such "NOT IN" queries that fuseki supports?
I've come up with my own for now. Would people mind commenting on
whether they believe that fuseki would support the query? It doesn't
seem to be negating the commonly occurring objects. I'm using Fuseki
0.2.4 and the tdbloader from "apache-jena-2.7.4-SNAPSHOT". The
intention is to find two distinct subjects that share the same objects
for a given predicate, negating the most common objects. I deem
"common" to be more than 100 occurrences in the TDB store.
-----
SELECT ?subj1 subj2
WHERE
{
?subj1 example:pred ?obj1 .
?subj2 example:pred ?obj1 .
FILTER (?subj1 != ?subj2)
{
SELECT ?veryPopularObj
WHERE
{
{
SELECT ?veryPopularObj (COUNT(?veryPopularObj) as ?objOccurrences)
WHERE
{
?s example:pred ?veryPopularObj .
}
GROUP BY ?veryPopularObj
}
FILTER (?objOccurrences > 100)
}
}
FILTER ( ?obj1 NOT IN (?veryPopularObj) )
}
