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A requires port can be specified to be injected:

requires injected ilogger l;

This indicates that the port can be bound to a corresponding port residing at any level in the system hierarchy. An injected port is the exception to the one to one rule, i.e., it allows many ports to be connected to a single instance. For this reason out events are not allowed in interfaces which are injected.

See Systems for a detailed description of the binding of injected ports.