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ValueSpecification (from Kernel ) on page 140.
A duration defines a value specification that specifies the temporal distance between two time instants.
• observation : Observation [*] Refers to the time and duration observations that are involved in expr
• expr : ValueSpecification [0..1] The value of the Duration.
No additional constraints.
A Duration defines a ValueSpecification that denotes some duration in time. The duration is given by the difference in time
between a starting point in time and an ending point in time.
A Duration is a value of relative time given in an implementation specific textual format. Often a Duration is a nonnegative
integer expression representing the number of time ticks which may elapse during this duration.
Changes from previous UML
This metaclass has been added.