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).

OIL has been developed at the Vrije Universiteit from Amsterdam, the Netherlands (and ??)

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

See also

• Description Logic
• DAML
• DAML+OIL