Discussion
What is a cardinality restriction?
Answer: C
Saying that a person has at most two biological parents, or a committee at least three members, uses a cardinality restriction on the relevant role. Such restrictions can render an ontology inconsistent when combined with assertions, which is precisely what makes them useful for detecting errors. Concept counts, domain size and inference limits are different notions. Constraints that can be violated are the ones that catch mistakes, which is why they are worth stating even when they seem obvious.
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