Hello everybody, for my master's thesis I'm working on a custom Stanbol Module. Its concrete purpose is not important. Basically I...
1. create a new triple collection using the TC Manager from Clerezza: tcManager.createMGraph(graphName); 2. import an Ontology which contains the Schema.org ontology amongst others: OWLOntologyManager manager = OWLManager.createOWLOntologyManager(); OWLOntology ontology = manager.loadOntologyFromOntologyDocument(content); tripleCollection.addAll(OWLAPIToClerezzaConverter.owlOntologyToClerezzaMGraph((OWLOntology) ontology)); 3. import a whole bunch of RDF statements: Parser parser = Parser.getInstance(); Graph rdfData = parser.parse(inputStream, format); tripleCollection.addAll(rdfData); Up to this point everything works fine. However, I ran into an issue when I wanted to query that triple collection using types from Schema.org. For example I have some entity which is of type schema:Movie. My ontology states that schema:Movie is rfds:subClassOf schema:CreativeWork which in turn is rfds:subClassOf schema:Thing. However it seems, that not there's no automatic inference that schema:Movie is also a subclass of schema:Thing. I tried it using this query: PREFIX rdf:<http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs:<http://www.w3.org/2000/01/rdf-schema#> PREFIX schema:<http://schema.org/> SELECT ?type ?label { <http://example.org/SomeEntity> rdf:type ?type . ?type rdfs:subClassOf schema:Thing . ?type rdfs:label ?label . } ... and this method: tcManager.executeSparqlQuery( QueryParser.getInstance().parse(query), tripleCollection ); Before I started implementing my project in Stanbol I imported my ontology as well as all the RDF files into a Sesame repository. With that repository the query worked fine as Sesame automatically inferred that SomeEntity is of type schema:Thing. Is there any way to configure an inference like this for the triple store that's used by Clerezza (Jena I Think?) in this example? Best regards, Marvin Luchs PS: @Reto Bachmann-Gmür: Thanks a lot for your "Instant Apache Stanbol" E-Book! I already decided to implement my project independently of Stanbol, but your book came out just in time to change my mind :-)
