Ontology Inference Layer

The Ontology Inference Layer OIL is a proposal for a web-based representation and inference layer for ontologies, which combines the widely used modelling primitives from frame-based languages with the formal semantics and reasoning services provided by description logics. It is compatible with RDF Schema (RDFS), and includes a precise semantics for describing term meanings (and thus also for describing implied information).

• http://www.ontoknowledge.org/oil/
• DAML+OIL (March 2001) Reference Description - http://www.w3.org/TR/daml+oil-reference