The Deterministic Part of IPC-4: An Overview
  We provide an overview of the organization and results of the deterministic
part of the 4th International Planning Competition, i.e., of the part concerned
with evaluating systems doing deterministic planning. IPC-4 attracted even more
competing systems than its already large predecessors, and the competition
event was revised in several important respects. After giving an introduction
to the IPC, we briefly explain the main differences between the deterministic
part of IPC-4 and its predecessors. We then introduce formally the language
used, called PDDL2.2 that extends PDDL2.1 by derived predicates and timed
initial literals. We list the competing systems and overview the results of the
competition. The entire set of data is far too large to be presented in full.
We provide a detailed summary; the complete data is available in an online
appendix. We explain how we awarded the competition prizes.
