Hello,
Could people recommend a good reference/tutorial on how to use built-ins
(greaterThan, difference, now etc) with dates (e.g., datetime, duration and so
on) in rules for the GenericRuleReasoner?
Example:
Assume a KB of conferences with their deadlines as xsd:dateTime.
Here are examples of SPARQL queries to find conferences whose deadlines are
passed:
SELECT * WHERE {
?subject here:hasDeadline ?date .
BIND((xsd:dateTime(?date) - now()) AS ?Span)
FILTER(?Span < "P0D"^^xsd:duration)
}
SELECT * WHERE {
?subject here:hasDeadline ?date .
FILTER(now() > xsd:dateTime(?date))
}
Suppose instead I wanted to infer some attribute of the conference, e.g:
?subject here:hasStatus here:DeadlinePassed
I don't really get how to do that in a rule and I can't quite figure if I'm
misusing the built-ins or just mixing SPARQL and rule syntax (e.g., when trying
to coerce variables to datatypes).
There's a bunch of recurring questions around that sort of rules but I can't
quite find any answer that's giving clear examples.
Thus I would find it useful if anybody could point at a resource that goes
through some sort of how to do date comparison and use that in rules as the
Jena doc on built-in is not self-contained in that respect.
https://jena.apache.org/documentation/inference/#rules
With many thanks and kind regards,
Pierre
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