UML2.1.1: 17.2.2 InformationItem (from InformationFlows):
'An information item is an abstraction of all kinds of information that can be exchanged between objects. It is a kind of
classifier intended for representing information at a very abstract way, one which cannot be instantiated.
..
represented : Classifier [*] Determines the classifiers that will specify the structure and nature of the information. An information item
represents all its represented classifiers. '
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