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The very first thing we need is a variable for the current time because the constraints' heuristics and cost/goal functions use this as input. For example, actions that are still to be executed should not be placed in the past. The variable is marked by a Current Time object constraint (see figure below).

The Extensible Object Constraint Current Time

As there can only be one current time, we need a structural constraint to prevent there being multiple variables representing the current time (see figure below).

The Structural Constraint Current Time

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Last update:
May 20, 2001 by Alexander Nareyek