Discussion
What is instance checking in a description logic?
Answer: A
Instance checking asks whether the asserted facts entail that a particular individual falls under a concept, which is how a reasoner classifies data rather than merely retrieving it. Non-emptiness, validation and counting are different queries. Together with subsumption it makes up the two standard reasoning services, one about concepts and one about individuals, and keeping them distinct clarifies what a reasoner is being asked to do.
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