| http://www.w3.org/ns/prov#value | - I have occasionally had a legitimate need for this kind of logic, and it usually involves multiple aggregates in the same SELECT, like count where FieldX is not null and then count where FieldX is null to compare the counts with each other, or count where FieldY = 2 and count where FieldY = 3 etc., again, to compare the counts.
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