High Quality Content by WIKIPEDIA articles! In information science, an upper ontology (top-level ontology, or foundation ontology) is an ontology which describes very general concepts that are the same across all domains. The most important function of an upper ontology is to support very broad semantic interoperability between a large number of ontologies accessible "under" this upper ontology. As the metaphor suggests, it is usually a hierarchy of entities and associated rules (both theorems and regulations) that attempts to describe those general entities that do not belong to a specific problem domain.

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