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How does a reasoner detect an inconsistent ontology?

  • A.It finds two assertions that contradict one another directly
  • B.It counts the number of axioms and finds it excessive
  • C.It fails to compute the subsumption hierarchy in time
  • D.It derives that some concept can have no instances at all

Answer: D

Inconsistency shows as a concept being subsumed by the empty concept, meaning nothing could possibly satisfy its definition, which usually indicates a modelling error rather than a discovery about the world. Direct contradictions are the simplest case of the same thing. Axiom counts and timeouts are unrelated. A check that turns a modelling mistake into a mechanically detectable condition is what makes large ontologies maintainable at all.

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