Ontologies (Information retrieval)

found: Work cat.: Fensel, D. Ontologies, 2001:p. 11 (An ontology is a formal, explicit, specification of a shared conceptualization)

found: Wikipedia, Aug. 31, 2005 (In information science, an ontology is the product of an attempt to formulate an exhaustive and rigorous conceptual schema about a domain. An ontology is typically a hierarchical data structure containing all the relevant entities and their relationships and rules within that domain)

found: Encyclopedia of information science and technology, 2005:vol. 4, p. 2214 (In artificial intelligence, ontology is defined as a design of a conceptualization to be reused across multiple applications)