I'm trying to implement a SPIN rule that will find the last event in a
set of events:
CONSTRUCT {
?this events:hasLastEvent ?lastEvent .
}
WHERE {
SELECT ?lastEvent
WHERE {
?lastEvent a events:InteractionEvent .
?lastEvent events:generatedBy ?this .
?lastEvent events:inXSDDateTime ?last .
}
ORDER BY DESC (?last)
LIMIT 1
}
It seems that the SELECT sub-query is evaluated once for ?this, and
then used for all other instances of ?this, that results in for
example
events:lamp1 events:hasLastEvent events:event1234
events:lamp2 events:hasLastEvent events:event1234
while events:event1234 is not even related to events:lamp2. The reason
why I think this is caused by the ?this keyword in the sub-query, is
that executing this query in SPARQL View provides the correct result.
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