sowa#situation__physical_mediating_occurrent___spatially_located_situation  click here for details
  supertype:  situation  something that "occurs" in a real/imaginary region of time and space
     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:  nexus__nexu__physical_mediating_thing  click here for details
     supertype:  mediating_thing__mediatingthing  Peirce/Sowa's notion of "thirdness"; click here for details
        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
     supertype:  physical__physical_thing  an entity that has a location in space-time; locations are themselves understood to have a location in space-time; click here for more details on the identical category sowa#physical_thing
        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:  occurrent__thing_without_temporally_stable_identity  click here for details
     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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