Instantiate an individual inside a 'then' stardog rule section.

[Agustín Martínez]

Hi. I'm wondering if i can instantiate an indivudal using a Stardog native rule.

For example:

[] a rule:SPARQLRule ;

  rule:content """

PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>

PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>

PREFIX : <http://MyExample#>

    IF {

?individual rdf:type :ClassOne;

:has_relWith ?otherIndividual.

                ?otherIndividual rdf:type :ClassTwo.

      }

    THEN {

                http://MyExample#newIndividualOfClassThreeIdXX rdf:type :ClassThree.    // Can i generate an aleatory number or use a sequence to add an id to the new Individual?

      }""" .

The problem is that, obviously, i need to generate a triplet with a different id for each individual.

If there's no way to do that, i was thinking about a Trigger. Did Stardog have something similar?

Regards,

Agustín 

[Héctor Pérez-Urbina]

Take a look at the "New Individuals with SWRL" section in [1].

1. http://docs.stardog.com/owl2/

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Best,
Héctor

[Agustín Martínez]

Hector, thanks!

I've done that but i have another problem. In my example, several ClassOne individuals can have a rel with a ClassTwo individual. The problem is that i have to to do something like this: If there's a rel between 1 ClassOne individual and one or more ClassTwo individuals, i just need ONE new ClassThree individual. Not one for each rel.

Thanks again,

Agustin