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Numerous different plan representations exist. There are two main ontologies: sequence-oriented and explicit timeline approaches. The following figure shows these paradigms.

Sequence-oriented approaches work on a branching time-point structure, in which world descriptions (sets of states) are linked by actions. In explicit timeline approaches, actions and states are related to a timeline. The sequence-oriented approaches' branching structure allows reasoning about multiple possible futures in a very direct way, whereas explicit timeline approaches focus on handling complex temporal relations.

• Sequence-oriented Representations
• Explicit Timeline Representations

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Last update:
May 19, 2001 by Alexander Nareyek