Page "TOID" Paragraph 5

Every object in OS MasterMap has its own TOID, including polygons, lines, points, symbols, text and addresses.

Complex entities such as Southampton Central railway station, are defined in terms of multiple TOIDs: one for the main building, several others for the platforms, and another for the pedestrian bridge over the tracks.

Users can create their own " supertoid " that unites them into one entity.

This also acknowledges that defining the boundaries of vaguely defined folk objects is subjective: should the station car-park be defined as part of the station, for example?

The TOID scheme leaves such decisions to its users, that is, those building information systems for end-users.