This is an old revision of the document!

Conventional OWL reasoners like Pellet or HermiT are interfaced via the OWL API. The interface currently supports reasoning about the class ontology, especially the computation of inferred subclasses. The interface code is contained in the package knowrob_common in the module knowrob_owlapi

There is a convenience predicate for calling the subclass-of relation which initializes the OWLAPI interface, copies the current class taxonomy from KnowRob, instantiates the reasoners and returns the inferred subclasses:

?- owlapi_subclass_of(Sub, Super)

For other inference tasks or more fine-grained control over the interface, one can also call the interface predicates directly

% initialize, load test data owl_parse('owl/knowrob_owlapi_test.owl', false, false, true), consult('prolog/owlapi.pl').

% create OWLAPI interfaces: ontology manager, data factory, create empty ontology owlapi_manager(OWLManager), owlapi_datafactory(OWLManager, DataFactory), owlapi_new_ontology('http://ias.cs.tum.edu/kb/knowrob.owl', OWLManager, OWLOntology).

% copy class taxonomy to the OWLAPI ontology findall(Res, add_to_ontology($OWLManager, $DataFactory, $OWLOntology, Res), _ResS).

% create a reasoner based on the current ontology owlapi_reasoner_hermit($OWLOntology, Reasoner).

% compute subclasses using the reasoner owlapi_subClassOf(Sub, 'http://ias.cs.tum.edu/kb/knowrob_owlapi_test.owl#CreateLiquid').

owl_parse('owl/knowrob_owlapi_test.owl', false, false, true), consult('prolog/owlapi.pl').

owlapi_manager(OWLManager), owlapi_datafactory(OWLManager, DataFactory), owlapi_new_ontology('http://ias.cs.tum.edu/kb/knowrob.owl', OWLManager, OWLOntology).

findall(Res, add_to_ontology($OWLManager, $DataFactory, $OWLOntology, Res), _ResS).

owlapi_reasoner_hermit($OWLOntology, Reasoner).

owlapi_subClassOf(Sub, 'http://ias.cs.tum.edu/kb/knowrob_owlapi_test.owl#CreateLiquid').