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3.3. Station authority files

Functionally, the station authority files support several lookup options: look up a location code; find the set of stations in a location; look up a station number; look up an alphabetic station code.

Hence, we define a base class BaseStationSet that describes the interface for these operations. Derived classes represent one of the station authority file formats.

For the details of this class, see Section 8, “class BaseStationSet: Base class for station authority objects”.