"General This Technical Specification defines a model and identification principles for the main fixed objects related to public access to Public Transport (e.g. stop points@ stop areas@ stations@ connection links@ entrances@ etc.)@ in particular: ?? To identify the relevant functions which need a unique identification of fixed objects especially for the Passenger Information domain in a multi-modal@ multi-operator context; ?? To identify the main fixed objects related to the Public Transport system@ choosing a certain viewpoint@ i.e. considering a certain level of detail (""granularity"") of the given description taking into account the needs of the identified functions; ?? To give a typology of these objects together with definitions; ?? To present relationships between the identified Public Transport objects; ?? To unambiguously describe these objects through their main properties (attributes); ?? To describe how to locate these objects in space through coordinates and through the link to topographic objects with a clear separation between the ""Public Transport layer"" and the ""topographic layer"" described in its turn by geographic objects; ?? To enable the assignment of data administration (responsibility for data maintenance) of each fixed object. Geospatial location referencing techniques of PT objects (e.g. use of satellites@ roadside equipment for positioning) or representation techniques on maps (projections) are outside the scope of this standard."