Relation dl#depends_on__dependson (dl#endurant,dl#quality_or_endurant_or_perdurant)
  subtype:  dl#physically_depends_on  dl#descriptively_depends_on
  inverse:  dl#depend_on_of
  supertype:  dl#mediated_relation (dl#entity,dl#entity)
     supertype:  dl#conceptual_relation (dl#entity,dl#entity)
        supertype:  pm#relation_playing_a_special_role (*)  this type permits to categorize relations according to their roles ; this is a traditional but quite subjective way of categorizing relations
           supertype:  pm#relation__related_thing__relatedthing___related_with (*)  type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type


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