>> "Yes/No" is an *answer* to a question. Databases (should) record simple
>> facts from which *questions* are constructed. Do you see that concept?

I think you got it backwards. Databases should record simple facts from
which *answers* can be constructed for questions. If "Yes/No" is an answer
to some question, the DBMS must allow for it be recorded so that other
questions can be answered. It is closure, remember?

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Anith