Exterior: When the geolocation describes a region, the exterior field refers to a list of latitude/longitude points that represent the vertices of a polygon. The first and last points must be the same. Thus, a minimum of four points is required. The following polygon restrictions from RFC5491 apply: - A connecting line shall not cross another connecting line of the same polygon. - The vertices must be defined in a counterclockwise order. - The edges of a polygon are defined by the shortest path between two points in space (not a geodesic curve). Consequently, the length between two adjacent vertices should be restricted to a maximum of 130 km. - All vertices are assumed to be at the same altitude. - Polygon shapes should be restricted to a maximum of 15 vertices (16 points that include the repeated vertex).

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