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).
From an theoretic view, OIL is one the the latest Description Logic (DL).
... south and east Africa, determined the course of the Zambesi, discovered Lake Nyasa
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Fernão de Magalhães, (Ferdinand Magellan, sea explorer)
Ferdinand Magellan, (c. ...