Ontology

A formal representation of a set of concepts within a domain and the relationships between those concepts. It is used to reason about the properties of that domain, and may also be used to define the limits of the domain.

In usual usage the word Ontology does not impose restrictions on the possible relationships available. In contrast a taxonomy only allows certain types of relationship and imposes additional restrictions on coverage.

Both a taxonomy and a folksonomy can be thought of as specialised types of Ontology with restrictions applied.

Many to Many, One to Many, One to One, Many to One

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The following pages link to here: Artificial Intelligence, Classification, Dictionary, Folksonomy, Knowledge Based Systems, Relationship, Software, Subject Matter Expert, Taxonomy