ISO 15926-2:2003: Industrial automation systems and integration -- Integration of life-cycle data for process plants including oil and gas production facilities -- Part 2: Data model. This ontology is based on the EXPRESS schema lifecycle_integration_schema.exp, http://www.steptools.com/sc4/archive/oil-and-gas/15926-0002-lifecycle_integration.exp?rev=1.1&content-type=text/vnd.viewcvs-markup, which ISO 15926-2 annex B references.