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  • Planning Domain Description Language (PDDL)
  • Based on STRIPS with various extensions
  • Created, in its first version, by Drew McDermott and others
  • Used in the biennial International Planning Competition (IPC) series
  • The representation is lifted, i.e., makes use of variables these are instantiated with objects
  • Actions are instantiated operators
  • Facts are instantiated predicates
  • A task is specified via two files: the domain file and the problem file
  • The problem file gives the objects, the initial state, and the goal state
  • The domain file gives the predicates and the operators; these may be re-used for different problem files
  • The domain file corresponds to the transition system, the problem files constitute instances in that system

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