Relation aktp#sender-of-information (aktp#Information-Transfer-Event,pm#cognitive_agent)
  subtype:  aktp#has-speaker
  supertype:  aktp#has-main-agent (aktp#Event,pm#cognitive_agent)   The agents causing the event to happen, if they are known. 
     supertype:  aktp#relation_about_an_event (?,?)
        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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