Ontology Inference Layer
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OIL (Ontology Inference Layer or Ontology Interchange Language) can be regarded as an Ontology infrastructure for the Semantic Web (see paper "OIL: An Ontology Infrastructure for the Semantic Web", IEEE Intelligent Systems, March/April 2001). OIL is based on concepts developed in Description Logic (DL) and frame-based systems and is compatible with RDFS.
OIL has been developed at the Vrije Universiteit from Amsterdam, the Netherlands (and ??)
Much of the work in OIL has now been incorporated into Web Ontology Language (OWL).