Hi everyone,
I'm having troubles with a SPIN rule that should insert triples with blank
nodes in a given graph.
I'm not sure if it comes from a misunderstanding I have using bnodes or a
bug in TopBraid Composer.
When I validate the rule in TBC, it sometimes automatically modify the
syntax. This is usually OK as the modified rule should be equivalent to the
one I entered. However, when I specify the graph where the triples have to
be inserted, the modified syntax imposed by TBC is not equivalent to the
one I entered.
For instance, when I don't specify the graph like in the following query,
everything is fine (the query is not modified when I validate) :
INSERT {
_:b0 a gbdlex:axie .
_:b0 gbdlex:link ?this .
}
WHERE {
?this a gbdlex:wordSense .
}
But with the same query where I specify the graph where the triples have to
be inserted :
INSERT {
GRAPH <http://kaiko.getalp.org/gbdlex/bridges/testBridge> {
_:b0 a gbdlex:axie .
_:b0 gbdlex:link ?this .
}.
}
WHERE {
?this a gbdlex:wordSense .
}
TBC rewrite the rule in the following form, that is not equivalent, when I
validate (press enter) :
INSERT {
GRAPH <http://kaiko.getalp.org/gbdlex/bridges/testBridge> {
[] a gbdlex:axie .
[] gbdlex:link ?this .
}.
}
WHERE {
?this a gbdlex:wordSense .
}
To the best of my understanding, the two occurrences of the shorten form []
are bound to two different bnodes whereas I need them to represent the same
bnode (as specified using the _:b0 syntax).
I tried other short syntaxes for bnodes as :
[] a gbdlex:axie ; gbdlex:link ?this .
or
[a gbdlex:axie] gbdlex:link ?this .
but TBC always rewrite the rule in the same non equivalent form.
I know that TBC automatically rewrite the rules that use deprecated SPARQL
syntaxes so I suspected a bug in this rewriting process.
Any help would be much appreciated !
Best
-----
David
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