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Q 的代码
q-construct-1.rq
PREFIX ns:
PREFIX :
CONSTRUCT
{ ?x ns:knows ?y }
WHERE
{ ?x ns:loves ?y }
q-lang-2.rq
PREFIX jfn:
SELECT ?v
{ ?x ?p ?v .
FILTER ( ! jfn:langeq(?v, "en" ) )
}
q-lang-1.rq
PREFIX jfn:
PREFIX rdfs:
SELECT ?v
{ ?x ?p ?v .
FILTER jfn:langeq(?v, "EN" )
}
q-regex-2.rq
prefix :
SELECT ?c
{ :x :str ?c .
FILTER regex(?c, "a", "i" )
}
q-regex-3.rq
prefix :
SELECT ?c
{ :x :str ?c .
:regex :pattern ?pat .
FILTER regex(?c, ?pat)
}
q-regex-4.rq
prefix :
SELECT ?c
{ :x :str ?c .
:regex :pattern ?pat .
:regex :flags ?flags .
FILTER regex(?c, ?pat, ?flags)
}
q-regex-5.rq
PREFIX xsd:
PREFIX :
SELECT ?s
{ ?s ?p ?o
FILTER regex(?o, "c$")
}
q-regex-1.rq
prefix :
SELECT ?c
{ :x :str ?c .
FILTER regex(?c, "a")
}
q-opt-1.rq
# An optional and an fixed pattern
PREFIX :
# This generates the right answer regardlesseh of planning order
SELECT *
WHERE
{
:x :p ?v .
OPTIONAL {:y :q ?v }
}
q-opt-3.rq
# An optional and an fixed pattern
PREFIX :
# Ensure an optional does not mask a later one.
# This query works unreordered because it has written out the needed UNION
S