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Sigma KEE - PortCity
KB Term: 

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PortCity
A City near a WaterArea.
Relationships      
Parents 都市 A LandArea of relatively small size, inhabited by a community of people, and having some sort of political structure. Note that this class includes both large cities and small settlements like towns, villages, hamlets, etc.
Children ContainerPort
 DeepDraftPort
 RiverPortRiverPort is the subclass of PortCity whose instances are port cities Adjacent to a navigable River.
 SeaPortSeaPort is the subclass of PortCity whose instances are port cities on or closely linked to a Sea or Ocean.


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