Relation aktp#relation_about_an_event (?,?)
  subtype:  aktp#sender-of-message  aktp#recipient-of-message  aktp#time-of-message  aktp#has-main-agent  aktp#has-other-agents-involved  aktp#has-location  aktp#event-product  aktp#means-of-transport-used  aktp#information-object-being-transferred  aktp#thing-acted-on  aktp#has-award-rationale  aktp#event-attended
  supertype:  aktp#relation (?,?)
     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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