#white_elephant.possession__whiteelephant  a valuable possession whose upkeep is excessively expensive
  supertype:  possession  anything owned or possessed
     supertype:  owned_entity__ownedentity
        supertype:  entity_playing_some_role  e.g., an agent, an owner
           supertype:  entity  something that can be "involved" in a situation
              supertype:  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:  thing_that_can_be_seen_as_a_relation  usable as relation type
              supertype:  thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
                 supertype:  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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