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Trigger (from Communications ) on page 474
A trigger specification may be qualified by the port on which the event occurred.
• port: Port [*] Specifies the ports at which a communication that caused an event may have arrived.
Specifying one or more ports for an event implies that the event triggers the execution of an associated behavior only if
the event was received via one of the specified ports.
The ports of a trigger are specified following a trigger signature by a list of port names separated by comma, preceded by
the keyword «from»:
‘«from»’ <port-name> [‘,’ <port-name>]*