UMLR — What is a DurationInterval

Identifies is better than points out.

Subsequent description is confusing about one/two NamedElements.

Suggest:

It identifies either a NamedElement whose enter and exit events are observed, or a pair of NamedElements for each of which either an enter or exit event is observed.
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When there are two events, firstEvent[i] is true to select the enter, or false to select the exit, event for observation of the corresponding event. —