UML22 — duration observation" vs DurationObservationAction etc

There is some inconsistency in the use of the terms "duration observation" vs. DurationObservationAction and "time observation" vs. TimeObservationAction in the diagrams on the above listed pages. In particular, figure 8-158 states that the visual elements in a Sequence Diagram are "DurationObservation" and "TimeObservation", when in fact they should be "DurationObservationAction" and "DurationObservationAction". The observations only occur when the action is taken - but the representation on the sequence diagram must be the action to be taken, not the effect of it. Compare this to figures on pp 351 & 360.

see above, resolved