http://www.w3.org/ns/prov#value | - In general, if there is a condition that I think is very likely (such as NoDataReturned, DivideByZero, etc...) OR is very easy to check for (such as an empty collection or a NULL-value), I try to check for it ahead of time and deal with it before I ever get to the point where I would have to catch an exception.
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