I note a few inconsistencies that should be easy to fix.
- Did Ed manage the Book department from 01-Apr-1987 to present?
As the benchmark data stands, this department didn't ever have a
manager, or a budget.
- In the valid-time selection-based taxonomy, there is not a place
for computed values from user-defined time (an example of which
appears as the last query in class O3.S2).
- The output-based taxonomy distinction between derived and
imposed doesn't seem to identify all the important possibilities. A
more refined substitute might be intersection (intersection of
underlying valid-time components), union (analogous), derived
(computed in some other way from the valid-time components), and
imposed (computed from values other than the underlying valid-time
components.)