#grammatical_relation__grammaticalrelation  a linguistic relation established by grammar
  subtype:  #concord {#transitivity #intransitivity}  #coreference  #conjunction  #complementation  #coordination.grammatical_relation  #subordination.grammatical_relation  #limiting  #mood  #anaphoric_relation  #voice.grammatical_relation  #inflexion  #aspect.grammatical_relation
  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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