Discussion
What does an existential restriction express?
Answer: A
Writing the concept of things having some child who is a doctor uses an existential restriction on the has child role, while the universal restriction says every child is a doctor, which is a different and weaker claim satisfied vacuously by the childless. Concept non-emptiness is a separate assertion. Distinguishing some from every, and noticing that the universal form is satisfied when the role is empty, is the commonest source of modelling error in these languages.
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