UMLR — Location p413 Final Node - Atomic behavior

It is often necessary to prevent an ActivityFinalNode from terminating behavior in the middle.
We recommend the creation of a stereotype for an Activity or Action, such as «atomic» which indicates that reaching an ActivityFinalNode on the diagram will allow the behavior to finish, but that no output tokens are emitted when this occurs.

This prevents some sorts of inconsistency that can occur when cancelling.