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A Place is a primitive Entity which depends on the concepts of LocalizablePlace ('a Place which can be localized by reference to spatial co-ordinates') and NonLocalizablePlace ('a Place which cannot be localized by reference to spatial co-ordinates'). The latter most
commonly refers to VirtualPlaces identified by such things as telephone numbers, URLs and Email addresses. At its most abstract, a Place is represented by a set of spatial co-ordinates or a VirtualPlaceID. At its most
concrete, it may be represented by an Entity which occupies those co-ordinates, such as a building, an area of land or a computer.
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