Relation pm#relation_to_a_domain__sub-domain_or_object-subdomain (?,domain)
  closed_exclusion:  relation_to_a_thing_that_is_not_a_domain
  subtype:  subdomain  subdomain_of_object
  type:  virtual_relation_type
  supertype:  domain_related_relation__domain-related-thing (?,?)
     supertype:  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:  relation__related_thing__relatedthing___related_with  type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type


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