UML22 — Explanation of Observation notation

UML2 Superstructure 2.1.1:Interactions

In Fig 14.26 there are various time annotations shown which relate to the Simple Time package.

The notation sections for TimeObservation and DurationObservation read thus:

TimeObservation: “A time observation is often denoted by a straight line attached to a model element. The observation is given a name that is shown close to the unattached end of the line.”

DurationObservation: “A duration observation is often denoted by a straight line attached to a model element. The observation is given a name that is shown close to the unattached end of the line.”

However the notations in Figure 14.26 look like this:

TimeObservation: “t=now”

DurationObservation: “d=duration”

I don’t see how the example notation is consistent with the notation descriptions

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