The role class “Site” should be used for localisation. It is also used for hierarchical organization. The definition of a “Site” is given in IEC 62264-1:2013, 5.3.3: “A site is a physical, geographical, or logical grouping determined by the enterprise. It may contain areas, production lines, process cells, and production units. Site planning and scheduling may involve cells, lines, or units within the areas. A geographical location and main production capability usually identifies a site. Examples of site identifications are ‘Deer Park Olefins Plant’ and ‘Johnson City Manufacturing Facility’. Sites are often used for rough-cut planning and scheduling. Sites generally have well-defined manufacturing capabilities.