  Temporal landmarks have been proved to be a helpful mechanism to deal with
temporal planning problems, specifically to improve planners performance and
handle problems with deadline constraints. In this paper, we show the strength
of using temporal landmarks to handle the state trajectory constraints of
PDDL3.0. We analyze the formalism of TempLM, a temporal planner particularly
aimed at solving planning problems with deadlines, and we present a detailed
study that exploits the underlying temporal landmark-based mechanism of TempLM
for representing and reasoning with trajectory constraints.
