====== Integration of OWL reasoners via OWLAPI ======
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**Note: This page describes experimental code that has not been used in a while. Please try it at your own risk.**
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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').