Dear all,
I will start to develop an engine to evaluate rules that combines SPARQL
commands with rule terms. The purpose is to be possible to define rules like:
ex:SportsMan ex:minimumSportsPlayed 1 .
ex:IronMan ex:minimumSportsPlayed 3 .
(?x rdf:type ?t) <-
?t ex:minimumSportsPlayed ?n .
(\\\SPARQL
(Select ?x
Where {
?x ex:playSport ?y .
}
group by ?x
having (count(1) >=&n)
\\\SPARQL).
Note: in a first approach syntax "&n" is to make reference to ?n .
my question is: how we should make reference to external variables in a Sparql
command?
To start the discussion, I have two proposals:
the symbol "&";
keep the symbol "?", where some variables must be instantiated before
the execution of the sparql command. Something like:
(?x rdf:type ?t) <-
?t ex:minimumSportsPlayed ?n .
(\\\SPARQL
(Select ?x
Where {
?x ex:playSport ?y .
}
group by ?x
having (count(1) >=?n)
\\\SPARQL).
Miguel
