OntoBroker supports multiple ontology languages:
OntoBroker provides native support for RDF/RDFS and OWL. This makes OntoBroker applicable for a wide range of semantic applications and scenarios. It is possible to use OntoBroker as a high-performance RDF triple store (or quad store), for typical OWL reasoning tasks (e.g. consistency checks) for conjunctive queries against an OWL ontology, for high performance ObjectLogic reasoning for evaluating and debugging rules. It is possible to use different storage systems with all ontology languages. This means that you can use the persistent storage H2 for storing OWL axioms, RDF triples and ObjectLogic facts and rules.
You can use SPARQL (W3C standard for RDF query languages) for executing queries in combination with all other ontology languages (see the "Query Languages" chapter for further details). OntoBroker also provides a powerful Java-based API which can be used to open, modify and store ontologies, convert ontology languages (e.g. from OWL to ObjectLogic) and to execute queries against an ontology. This API was designed to be independent from the ontology language. This makes it easy to access OntoBroker from your own applications and to write applications which can deal with all ontology languages.
The ontology language can be set in the OntoConfig.prp configuration file of the OntoBroker server:
OntologyLanguage = ObjectLogic
OntologyLanguage = RDF
OntologyLanguage = OWL