#hypothetical_creature  a creature that has not been observed but is hypothesized to exist
  subtype:  #extraterrestrial_being  a form of life assumed to exist outside the Earth or its atmosphere
  supertype:  #imaginary_being__imaginarybeing__imaginary_creature__imaginarycreature  a creature of the imagination
     supertype:  pm#imaginary_spatial_entity__imaginaryspatialentity  e.g., a cartoon character
        supertype:  pm#imaginary_entity__imaginaryentity  an entity that has been imagined
           supertype:  pm#entity_playing_some_role  e.g., an agent, an owner
              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#thing_that_can_be_seen_as_a_relation  usable as relation type
                 supertype:  pm#thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
                    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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