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What is a timeline in a temporal planning system?

  • A.A schedule assigning each action to a particular resource
  • B.A record of what holds over each interval for a state variable
  • C.The sequence in which the planner considered the actions
  • D.The total time the plan will take to execute completely

Answer: B

Timeline based planners maintain, for each state variable, the intervals over which each value holds, and actions are constraints on those timelines. Spacecraft operations planners are typically built this way. Search order, total duration and resource assignment are different notions. Organising a plan around what is true when, rather than around a sequence of actions, is a different representation that suits domains where many things happen at once.

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