Michael,
have you tried using another variable than ?this ?
Also, inner (nested) SELECTs may not use the same variable bindings as
the outer parts of a query. For this reason I usually replace inner
SELECTs with SPIN magic properties because then I can better control the
pre-binding of arguments.
HTH
Holger
On 1/22/2014 0:09, Michael B. wrote:
Hi everyone!
I've got a weird case here. I am trying to use SPIN rules to match
tools and tasks. Each my:Task has a set of owl:Restriction instances.
A set of spin rules tries to find tools that fulfil specific
requirements. I then would like to use another SPIN rule to find tools
that fulfil ALL the requirements of a task.
I came up with something like this:
CONSTRUCT {
?task :suitableTool ?tool .
}
WHERE {
?task a :Task.
?task :numRestrictions ?x .
{
SELECT ?tool ((COUNT(?constraint)) AS ?fulfilled)
WHERE {
?task :hasConstraintRestriction ?constraint .
?constraint :fulfilledby ?tool .
}
GROUP BY ?tool
} .
FILTER (?fulfilled > ?x) .
}
Since it's quite hard to compare two sets, I'm going with counts here...
In the SPARQL view, I'm getting a nice table of
X suitableTool B.
X suitableTool C.
Y suitableTool C.
When I add this to the spin:rule section of my Task class (I tried
Thing as well), nothing happens.
The numRestrictions property is filled by a SPIN rule as well:
CONSTRUCT {
?this :numRestrictions ?count .
}
WHERE {
{
SELECT ?this ((COUNT(?res)) AS ?count)
WHERE {
?this :hasConstraintRestriction ?res .
}
GROUP BY ?this
} .
}
Is it possible that the order in which the rules are executed causes
the property to "disappear" (shouldn't incremental reasoning prevent
this?) during the reasoning?
Regards,
Michael
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