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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