2011-11-26 PDDL related links About PDDL ( In japanese ) http://d.hatena.ne.jp/hanecci/20100220/1266681999 PDDL papers http://ipc.informatik.uni-freiburg.de/PddlResources PDDL books Understanding Planning Tasks: Domain Complexity and Heuristic Decomposition. Malte Helmert http://www.amazon.com/gp/product/3540777229/ref=oh_o00_s00_i00_details