OIL
'''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). Much of the work in OIL has now been incorporated into OWL.