Does JENA API support OWL 2?

Question

May I know if Apahe JENA supports OWL 2 syntax in Java? It does mentioned that in the documentation ( https://jena.apache.org/documentation/ontology/ ) it only provide limited cardinality restrictions. I would like to confirm this from the experts.

Answer 1

Apache Jena does not support OWL2, only OWL11 through org.apache.jena.ontology.OntModel interface. See also documentation .

But you still can work with OWL2 in Jena using some external jena-based APIs and tools, eg ONT-API , that is OWL-API -api( v5 ) impl over Jena.

In ONT-API there are two main OWL2 view of data, which encapsulate the same RDF Graph: com.github.owlcs.ontapi.jena.model.OntModel and com.github.owlcs.ontapi.Ontology ( in older versions (ONT-API: v1.xx ) these classes have names ru.avicomp.ontapi.jena.model.OntGraphModel and ru.avicomp.ontapi.OntologyModel respectively ).

The com.github.owlcs.ontapi.jena.model.OntModel view is a full analogue of Jena org.apache.jena.ontology.OntModel , it is the facility to work with triples. And the com.github.owlcs.ontapi.Ontology view is an extended org.semanticweb.owlapi.model.OWLOntology , the facility to work with axiomatic data, that is backed by the com.github.owlcs.ontapi.jena.model.OntModel view and vice-versa.

For example, the following snippet:

    String uri = "https://stackoverflow.com/questions/54049750";
    String ns = uri + "#";
    OntModel m = OntModelFactory.createModel()
            .setNsPrefixes(OntModelFactory.STANDARD).setNsPrefix("q", ns);
    m.setID(uri);
    OntClass c = m.createOntClass(ns + "c");
    OntObjectProperty p = m.createObjectProperty(ns + "p");
    OntIndividual i = c.createIndividual(ns + "i");
    m.createObjectComplementOf(m.createObjectUnionOf(c, m.getOWLThing(),
            m.createObjectSomeValuesFrom(p, m.createObjectOneOf(i))));
    m.write(System.out, "ttl");

will produce the following ontology:

@prefix q:     <https://stackoverflow.com/questions/54049750#> .
@prefix rdf:   <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix owl:   <http://www.w3.org/2002/07/owl#> .
@prefix xsd:   <http://www.w3.org/2001/XMLSchema#> .
@prefix rdfs:  <http://www.w3.org/2000/01/rdf-schema#> .

<https://stackoverflow.com/questions/54049750>
        a       owl:Ontology .

q:c     a       owl:Class .

q:p     a       owl:ObjectProperty .

q:i     a       owl:NamedIndividual , q:c .

[ a                 owl:Class ;
  owl:complementOf  [ a            owl:Class ;
                      owl:unionOf  ( q:c owl:Thing
                                     [ a                   owl:Restriction ;
                                       owl:onProperty      q:p ;
                                       owl:someValuesFrom  [ a          owl:Class ;
                                                             owl:oneOf  ( q:i )
                                                           ]
                                     ]
                                   )
                    ]
] .