Author: Bernhard Aichernig
This example due to Abrial has been translated from the
B-notation into VDM-SL. It demonstrates how an event-based
system may be modeled using the specification language
of the Vienna Development Method. In the following,
operations specify the events which can be initiated
either by the system or by a subscriber (user). An
implicit style using pre- and post-conditions has
been chosen, in order to model the system's state
transitions. The model of the telephone exchange is
centred around a set of subscribers who may be engaged
in telephone conversations through a network controlled
by an exchange.
Language Version: classic
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