13.3.9 Duration

*Generalizations

   • ValueSpecification (from Kernel ) on page 140.

   Description

   A duration defines a value specification that specifies the temporal distance between two time instants.

   Associations

   • observation : Observation [*] Refers to the time and duration observations that are involved in expr

   • expr : ValueSpecification [0..1] The value of the Duration.

   Constraints

   No additional constraints.

   Semantics

   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.

   Notation

   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.