Relation pm#relation_to_a_thing_that_is_not_a_domain__domain-related-object (?,pm#thing_that_is_not_a_domain)
  closed_exclusion:  pm#relation_to_a_domain
  subtype:  pm#domain_object  pm#object_in_domain
  type:  pm#virtual_relation_type
  supertype:  pm#domain_related_relation__domain-related-thing (?,?)
     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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