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User's models must derive from this base class. Models must be used to
hold the data of the application. They can be connected to
observers (like Constrollers) by a mechanism discussed by
section 4.2. It is important to note that apart from the registration
phase, the model do not know that there exists a set observers connected
to it.
All the code strictly related to the data of the application (i.e. not
related to any view of those data) will live in the model class.
Roberto Cavada
2004-11-16