Relation akts#has-variant-name__hasvariantname (?,pm#string)
  supertype:  rdfs#label (?,pm#string)  in WebKB, with FO, use the link '_'
     supertype:  pm#name (?,?)
        supertype:  pm#attributive_relation__attributiverelation (*)  like pm#binary_relation, this type mostly exists to categorize what cannot be categorized elsewhere
           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
              >part of:  pm#relation__related_thing__relatedthing___related_with  type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type