sowa#nexus__nexu__physical_mediating_thing  click here for details
  subtype:  structure  situation
  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

No statement uses or specializes nexus; click here to add one.