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Why is representing time necessary for many applications?

  • A.Facts without times cannot be stored in a database
  • B.Most interesting facts hold only over particular periods
  • C.Reasoning is faster when facts are indexed by time
  • D.Time is required by every standard ontology language

Answer: B

Employment, ownership, location and almost every practically interesting relation hold during some interval and not others, and a representation without times can only describe a snapshot. Speed, standards and storage are not the reason. That the great majority of real facts are temporally qualified, while the simplest formalisms cannot say so, is why so much of knowledge representation is concerned with time in one form or another.

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