PDDL2.1: the art of the possible? commentary on fox and long

  • Authors:
  • Drew McDermott

  • Affiliations:
  • Dept of Computer Science, Yale University, New Haven, CT

  • Venue:
  • Journal of Artificial Intelligence Research
  • Year:
  • 2003

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Abstract

PDDL2.1 was designed to push the envelope of what planning algorithms can do, and it has succeeded. It adds two important features: durative actions, which take time (and may have continuous effects); and objective functions for measuring the quality of plans. The concept of durative actions is flawed; and the treatment of their semantics reveals too strong an attachment to the way many contemporary planners work. Future PDDL innovators should focus on producing a clean semantics for additions to the language, and let planner implementers worry about coupling their algorithms to problems expressed in the latest version of the language.