Relation dl#conceptual_relation (dl#entity,dl#entity)
  subtype:  dl#immediate_relation  dl#mediated_relation
  inverse:  dl#conceptual_relation
  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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