pm#nature_park
  subtype:  #national_park  a tract of land declared by the national government to be public property
  supertype:  pm#tourist_attraction__touristattraction
     supertype:  pm#attraction
        supertype:  pm#thing_needed_for_some_process
           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

3 statements are about indirect instances of pm#nature_park: wotif#graph1_on_national_park, wotif#graph2_on_national_park, wotif#graph3_on_national_park
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