Foundation of Intelligent Physical Agents. FIPA Ontology service specification [online]. Version D. Geneva: Foundation for Intelligent Physical Agents, © 2000, 2001-08-15 [cit. 2013-04-18]. Document number: XC00086D Dostupné z: http://www.fipa.org/specs/fipa00086/XC00086D.html nebo z http://www.fipa.org/specs/fipa00086/XC00086D.pdf.