Dr. Gruber was well known for his definition of “ontology”. In this interview, he sticks with that definition and stressed the importance of “design ontology”. He also mentions several terms like “semiformal ontology”, which consists of both an informal textual description and formal terms. That provides authors the freedom of encoding knowledge between fully formal and purely infomal. The success of an ontology should be evaluated by its followers and adoption but not its theoritical expressiveness.

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