I'm trying to construct a graph depending on
a) an existing graph +
b) the already created part of the new graph.
Does the WHERE part of an INSERT statement only consider the graph before
starting the INSERT? Or should it consider the newly created triples already?
Here is what I tried:
# construct a GO for all subjects in knows-relations
INSERT {
_:0 a :GO .
_:0 :represents ?who .
}
WHERE {
?who :knows ?whom .
NOT EXISTS {
?someGO :represents ?who .
} .
}
Although using NOT EXISTS, in the first run, I create more blank nodes than I
want to. In additional runs then everything works as expected.
I'm happy for any hints. Do I expect too much of SPARQL here? Or am I only
missing some setting? I could not explicitly find something about this issue in
the SPARQL 1.1 Update specification. Does anybody know an alternative to
achieve that the newly created triples are immediately considered in the WHERE
clause?
Jan
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