First, a general comment on the formulation of queries is presented. Then, several queries that did not fit the classification schema are listed.
General Comment : English easily allows the specialization from elements to intervals through the word ``continuous'', but it unfortunately has no simple, natural way of expressing the reverse generalization. Hence we must include elements – discontinuous blocks of time – unless continuity is explicitly required.
Class 01.S11 (None)
Query: What skills did Ed and Edward have in common?
Answer: ``Driving'', ``Filing'' and ``Typing''
Category: (Projected, None) / (Duration, Element, Computed) / (=, Constant) (=, Constant)
Class 02.S11 (None)
Query: How long was Ed's salary at least 40K?
Answer: ``4 years 9 months''
Category: (None, Element, Derived) / (Duration, Element, Computed) / (=, Constant) (< >, Constant)
Class 03.S11 (None)
Query: When, how much and by whom was the highest salary by a female employee earned?
Answer: ``09/01/86–01/01/90, 50K, Di''
Category: (Projected, Element, Derived) / (Duration, Element, Computed) / (=, Constant)
Query: When and for which department was the budget at least 200K?
Answer: ``(08/01/84–01/01/90, Toy)''
Category: (Projected, Element, Derived) / (Duration, Element, Computed) / (=, Constant)