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In philosophy, a core ontology is a basic and minimal ontology consisting only of the minimal concepts required to understand the other concepts. It must be based on a core glossary in some humanlanguage so humans can comprehend the concepts and distinctions made. Each natural language tends to rely on its own conceptual metaphor structure, and so tends to have its own core ontology (according to W. V. Quine). It could be said also to represent the moral core of a human linguisticculture, and to self-correct so as to better represent core cultural ideas.
Such a core ontology is a key pre-requisite to a more complete foundation ontology, or a more general philosophical sense of ontology. Most applicable to teaching, e.g. the Longmansdefining dictionary of the simplest meanings of 2,000 English words is used to define the 4,000 most basic English idioms—this is a core glossary of the English language, which permits access to the core ontology (the idioms).
Core ontologies is a concept that is used in information science as well. For example, CIDOC-CRM and CORA are considered as core ontologies.