14.5 Exercises 345
The issue of robust estimates for temporal periods and other parameters is well
known in scheduling and is being explored in planning (e.g., [139]). The problem of
contingent temporal variables and constraints is fairly well addressed [403, 530, 531,
532]. But a good integration of the proposed techniques into planning procedures
remain to be further explored, eventually within the wider context of CSPs with
contingent variables along approaches such as [185, 542].
The two approaches presented in this chapter are very close and involve similar
techniques. The temporal database representation has didactic merits because its
operators are closer to the familiar classical planning operators and it allows an
easier introduction to the ...