#racial_segregation  segregation by race
  subtype:  #petty_apartheid  racial segregation enforced primarily in public transportation and hotels and restaurants and other public places
  supertype:  #segregation.social_organization  a social system that provides separate facilities for minority groups
     supertype:  #social_organization__social_structure__social_system__structure  the people in a society considered as a system organized by a characteristic pattern of relationships; "the social organization of England and America is very different"; "sociologists have studied the changing structure of the family"
        supertype:  #system  a group of independent but interrelated elements comprising a unified whole; "a vast system of production and distribution and consumption keep the country going"
           supertype:  #group__grouping  any number of entities (members) considered as a unit
              supertype:  pm#collection  something gathering separated things (entities/situations)
                 supertype:  pm#divisible_entity__divisibleentity  many classifications under this category are application-dependant
                    supertype:  pm#entity  something that can be "involved" in a situation
                       supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
                    supertype:  pm#divisible_thing__divisiblething
                       supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

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