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The creation of an informationFlow requires the selection of an existing Classifier or InformationItem or the creation of a new one. Although a DataType is a Classifier the selection of DataTypes is not allowed.
The following constraint in UML2 specification restricts the kind of Classifier that may be used : [1] The sources and targets of an information item (its related information flows) must designate subsets of the sources and targets of the representation information item, if any. The Classifiers that can realize an information item can only be of the following kind: Class, Interface, InformationItem, Signal, Component.