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Sigma KEE - PerimeterArea
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周边区域
A PerimeterArea is a region that extends outward from a boundary with another region, surrounding or partially surrounding it, but which is not part of that other region. See BorderFn and PerimeterAreaFn.
Relationships      
Parents 地区 A topographic location. Regions encompass surfaces of Objects, imaginary places, and GeographicAreas. Note that a Region is the only kind of Object which can be located at itself. Note too that Region is not a subclass of SelfConnectedObject, because some Regions, e.g. archipelagos, have parts which are not connected with one another.
Children 均匀的周边区域A UniformPerimeterArea is one that has a defined uniform width.


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