Wrote 15 minutes today.
I worked on the revision to the 1999 Wand, Storey, And Weber article in Transactions on Database Systems (TODS). I'm dealing with the validity of allowing optional attributes in class definitions. I'm wondering about the difference between "is married" as a property that is either true or false, "years married" which is zero or more and "date married" which must allow a null value for an individual that has never been married. Semantically there seems little difference in the latter two, but clearly one is optional while the other is not.
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