performance of createIndividual with OntModel

[David Jordan]

I am getting a performance result of around 1 minute clock time to execute 
OntClass.createIndividual. Is this expected? Below is the relevant part of the 
ontology and the Java code. Every line of code runs fast except the 
createIndividual. Is this due to reasoning being kicked off for the first time? 
I’ll see if adding a second individual is just as slow.

veh:numWheels a   owl:DatatypeProperty ;
      rdfs:domain veh:Vehicle ;
      rdfs:range xsd:integer .

veh:Vehicle
      a       owl:Class ;
      rdfs:subClassOf
              [ a       owl:Restriction ;
                owl:maxCardinality """1
                        """^^xsd:nonNegativeInteger ;
                owl:onProperty veh:numWheels
              ] .

veh:Motorcycle
      a       owl:Class ;
      rdfs:subClassOf veh:Vehicle ;
      owl:equivalentClass
              [ a       owl:Restriction ;
                owl:hasValue "2"^^xsd:nonNegativeInteger ;
                owl:onProperty veh:numWheels
              ] .


Here is the Java code.

Model model = getNamedModel(VEHICLE_MODEL_NAME);
OntModelSpec spec = new OntModelSpec(OntModelSpec.OWL_DL_MEM_RULE_INF);
OntModel omodel = ModelFactory.createOntologyModel(spec, model);
OntClass bikeClass = omodel.getOntClass(uriBase + "Motorcycle");
Individual myBike = bikeClass.createIndividual(uriBase + "data/myBike");

This is with latest SDB and Postgres.
Is there anything in the ontology causing the slowdown?

David Jordan
Senior Software Developer
SAS Institute Inc.
Health & Life Sciences, Research & Development
Bldg R ▪ Office 4467
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Tel: 919 531 1233 ▪ david.jor...@sas.com<mailto:david.jor...@sas.com>
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