July 2004
Intermediate to advanced
752 pages
35h 59m
English
book
Unified Modeling Language Reference Manual, The, Second Edition
by James Rumbaugh, Ivar Jacobson, Grady Booch
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timing mark
A denotation for the time at which an event occurs. Timing marks may be used in constraints.
Semantics
A timing mark is the time at which an event occurs.
Notation
A timing mark is shown as a tick mark (a short horizontal line) even with an event on a sequence diagram. The name of the timing mark is placed next to the tick mark and may be used in timing expressions. See Figure 14-281 for an example.
Discussion
Note that a time observation action is not a satisfactory substitute for a timing mark. Although timing marks are not part of the official UML2 specification, we recommend their use because the capability is otherwise lacking.
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