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What is a category in an ontological representation?

  • A.A label attached to an individual for retrieval purposes
  • B.A class of objects sharing properties, itself an object
  • C.A partition of the knowledge base into separate files
  • D.A syntactic grouping of the terms used in a language

Answer: B

Categories are reified so that properties can be attributed to them, letting one say that the category of dogs is a subcategory of mammals or that it has many members. Membership and subclass relations then organise the whole knowledge base. Partitions, syntactic groupings and labels are different notions. Making a class into an object, so that facts about the class as such can be stated, is reification applied at the level of the taxonomy itself.

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