Durative actions start & end times

[albore]

Reviewer 3.: how durative actions get assigned their starting and end times?

Note: from PDDL2.1 (Fox & Long 2003)

The modelling of temporal relationships in a discretised durative action is done by means of temporally annotated conditions and effects. All conditions and effects of durative actions must be temporally annotated. The annotation of a condition makes explicit whether the associated proposition must hold at the start of the interval (the point at which the action is applied), the end of the interval (the point at which the final effects of the action are asserted) or over the interval from the start to the end (invariant over the duration of the action).