Relation aktp#relation (?,?)
  subtype:  aktp#relation_about_an_area_of_interest  aktp#relation_about_a_publication  aktp#relation_about_an_organization  aktp#relation_about_a_location  aktp#relation_about_a_person  aktp#relation_about_an_event  aktp#relation_about_technology  aktp#relation_about_a_project
  supertype:  pm#relation_coming_from_an_ontology (*)
     supertype:  pm#relation_for_an_application (*)  relation introduced by an application
        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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