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Why is a partition of a category useful to state?

  • A.It divides the knowledge base into manageable sections
  • B.It reduces the number of categories that must be defined
  • C.It allows the category to be stored more efficiently
  • D.It asserts that the subclasses are disjoint and exhaustive

Answer: D

Declaring that animals are exactly the union of vertebrates and invertebrates, and that nothing is both, licenses inferences that neither subclass statement alone permits, such as concluding invertebrate from not vertebrate. Storage, file organisation and category counts are unrelated. Stating disjointness and exhaustiveness explicitly, rather than leaving them implicit in the modeller's intention, is what converts a taxonomy from documentation into something a reasoner can use.

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