Defined connection point of a functional unit which can be connected to other functional units.

Note 1: “Defined” means that the requirements and the assured properties of this connection point are described.

Note 2: The connection between the interfaces of function units is also called an interface.

Note 3: In an information system, the defined exchange of information takes place at this point.

Note 4: Interface places certain requirements on the connection that is to be made.

Note 5: Interface demands certain features.

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