#voice.grammatical_relation  (linguistics) the grammatical relation (active or passive) of the grammatical subject of a verb to the action that the verb denotes
  subtype: {#active_voice #passive_voice}
  supertype:  #grammatical_relation__grammaticalrelation  a linguistic relation established by grammar
     supertype:  #linguistic_relation  a relation between linguistic forms or constituents
        supertype:  #relation  an abstraction belonging to or characteristic of two entities or parts together
           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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