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How can I draw an activity diagram for this use case below?
User opens a closeable window to view a live update of xyz-data.
Specifically, I want to show an object flow in an activity diagram, but the object is an
observable data-storage object (i.e., the GUI control is bound to this data and thus shows a
live view of the data).
It’s still an object isn’t it? You can either mark it by a special class (i.e.
:ObservableDataStorage) or a Stereotype or Keyword (i.e.<<Observable>> : DataStorage). Or/and you can use a relation which is named “observes” between the observer and the observable.