Hi K.J.,
the iteration in your second example would not work because CONSTRUCTs
can only ever add new triples, never overwrite previous iterations.
In general SPARQL you could use a nested SELECT and the SUM aggregator:
CONSTRUCT {
?A ns:HasFinalScore ?FS .
}
WHERE {
SELECT (SUM(?IS) AS ?FS)
WHERE {
?this ns:KRIPredictsRiskFactor ?A .
?this ns:InstanceHasInstanceScore ?IS .
}
}
However this is not working as a SPIN rule, because the binding of ?this
will not be passed into the nested WHERE, and you would get a "wildcard"
matching for ?this instead. So SPIN's trick to pre-bind ?this cannot be
used here, and you need to push the iteration logic into the nested
WHERE clause. Try the following spin:rule:
CONSTRUCT {
?A ns:HasFinalScore ?FS .
}
WHERE {
SELECT ?A (SUM(?IS) AS ?FS)
WHERE {
?x ns:KRIPredictsRiskFactor ?A .
?x ns:InstanceHasInstanceScore ?IS .
}
}
(As an advanced solution, if you want to use ?this, you could factor the
nested sub-select into a SPIN function that takes the value of ?this as
its argument. This is the mechanism that I am typically using for such
nested selects).
HTH
Holger
On 9/20/2014 22:39, K. J. Toad wrote:
Hello everyone
I am a beginner with SPARQL and SPIN and am currently trying to build
my first ontology. I was able to figure out all problems with the help
of online research, but don't know how to fix my current one:
I want to iterate through various sub-concepts with 1 to 6 instances
each. While iterating I want to add up the instance values and bind
them to (another concept's) instance's final value. The following code
specifying a sub-concept with 3 instances works smoothly.
*CONSTRUCT*{
?A ns:HasFinalScore ?FS .
}
*WHERE*{
ns:1 ns:InstancePredicts ?A ;
ns:InstanceHasInstanceScore ?IS1 .
ns:2 ns:InstancePredictsRiskFactor ?A ;
ns:InstanceHasInstanceScore ?IS2 .
ns:3 ns:InstancePredictsRiskFactor ?A ;
ns:InstanceHasInstanceScore ?IS3 .
*BIND* (((?IS1 + ?IS2) + ?IS3) *AS* ?FS) .
}
When I try to run a template on the cub-concept that has those three
instances (as indicated with the following code), it won't work anymore.
*CONSTRUCT*{
?A ns:HasFinalScore ?FS .
}
*WHERE*{
*?this* ns:KRIPredictsRiskFactor ?A .
*?this* ns:InstanceHasInstanceScore ?IS .
?A ns:HasFinalScore ?FSold .
*BIND* ((?FSold + ?IS) *AS* ?FS) .
}
Can you guys please help me figure out what the problem is?
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