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It is a stereotype ?«externalSystem?» of the UML element actor .
Defi nitions
A user system is a special external system serving a user as a medium to interact
with the system.
It is a stereotype ?«userSystem?» as a specialization of the stereotype
?«externalSystem?» .
A boundary system is a special external system serving another external system
as a medium to interact with the system.
It is a stereotype ?«boundarySystem?» as a specialization of the stereotype
?«externalSystem?» .
An actuator is a particular external system that serves the system to influence
its environment.
It is a stereotype ?«actuator?» as a specialization of the stereotype
?«externalSystem?» .
A sensor is a special external system that accepts information from the environment
and forward it to the system.
It is a stereotype ?«sensor?» as a specialization of the stereotype
?«externalSystem?» .
A mechanical system is a special external system that has only mechanical
aspects from the system??™s view.
It is a stereotype ?«mechanical system?» as a specialization of the stereotype
?«externalSystem?» .


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