UML25 — Duration Definition

"the temporal distance between two time instants "

is not necessarily true. The value may be derived by an arbitrary computation over the set of observations. Could be three standard deviations.

Suggest "a temporal distance as a DurationObservation or as a computation over a set of observations

The suggested change leaves Duration defined in terms of “temporal distance”, but essentially leaves “temporal distance”
undefined. To have a meaning, a “distance” must be between two things. However it is computed, a Duration
is always, in the end, by definition, a “distance between two time instants”, the beginning and the end of the Duration.
Note that this statement in no way requires that the observations used to compute the Duration be limited to just giving
the beginning and end time instants – the observations are just used in some way to determine those instants and define
the Duration.
Disposition: Closed - No Change