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A TimeEvent specifies a point in time. At the specified time, the event occurs.
Event (from Communications ) on page 459
A time event specifies a point in time by an expression. The expression might be absolute or might be relative to some other
point in time.
Issue 9191 - add default value
• isRelative: Boolean Specifies whether it is relative or absolute time. Default value is false.
• when: TimeExpression  Specifies the corresponding time deadline.
No additional constraints
A time event specifies an instant in time by an expression. The expression might be absolute or it might be relative to some
other point in time. Relative time events must always be used in the context of a trigger and the starting point is the time
at which the trigger becomes active.
Semantic Variation Points
There may be a variable delay between the time of reception and the time of dispatching of the TimeEvent (e.g., due to queueing
A relative time trigger is specified with the keyword ‘after’ followed by an expression that evaluates to a time value, such
as after (5 seconds). An absolute time trigger is specified with the keyword ‘at’ followed by an expression that evaluates
to a time value, such as Jan. 1, 2000, Noon.
<time-event> ::= <relative-time-event> | <absolute-time-event><relative-time-event> ::= ‘after’ <expression><absolute-time-event> ::= ‘at’ <expression>
Changes from previous UML
The attribute isRelative has been added for clarity.