Unit modifier marking a Function Unit as an operation in the sense of the Flow Design paradigm.
The term
operation has the same meaning as in the IODA architecture.
Operation units are implementing the real functionality of the software system. They are the basic
components of a software system wired together by
Integration Units.
Only operation units contain logic and control flow implementations.
For every declared port
a in this list of inputPorts a method
process$a with a parameter
of the port's type must be implemented for processing the incoming messages.