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TOID
A TOID (TOpographic IDentifier, pronounced ''toyed'') is a unique reference identifier assigned by the Ordnance Survey to identify every feature in Great Britain. The identifier consists of two parts, a prefix ‘osgb’ and a unique identifier that is 13-16 digits long. In GML 2, a TOID is encoded as a gml:fid (Feature Identifier); in GML 3 as a gml:id.
Around 440 million man-made and natural features have been thus identified: buildings, roads, fields, phone boxes, pillar boxes, landmarks and many other types. The identification system is designed to be used in GIS, digital cartography and in any customized computer application, including non-cartographic ones, where information about fixed, real-world features needs to be managed. Using consistent identifiers (IDs) makes it much easier to share data between various kinds of applications and systems. A TOID remains constant throughout the lifetime of the real-world feature it identifies, and is guaranteed not to be reassigned to anything else when the feature no longer exists.
Example: the TOID for the Tower of London is osgb1000006032892.
==TOIDs in OS MasterMap==
OS MasterMap, Ordnance Survey's master database, depends on TOIDs. Every feature is identified by a TOID in MasterMap. Other attributes of the feature are defined by relating them, via GML, to the TOID. Users of OS MasterMap relate their own data to TOIDs of items of interest to them. Unlike with a custom designed GIS, one organization can share data with another organization easily since TOIDs are maintained centrally by Ordnance Survey, and are free to reuse.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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