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13.3.19 Observation



   PackageableElement (from Kernel ) on page 111


   Observation is an abstract superclass of TimeObservation and DurationObservation into allow TimeExpression s and Durations to refer to either in a common way.


   No additional attributes


   No additional associations


   No additional constraints


   No additional semantics



   Changes from previous UML

   The metaclass has been added.