Relation dl#location (dl#entity,dl#region)
  subtype:  dl#physical_location  dl#temporal_location
  inverse:  dl#location_of
  supertype:  dl#exact_location__exactlocation (dl#entity,dl#region)
     supertype:  dl#generic_location__genericlocation (dl#entity,dl#entity)
        supertype:  dl#mediated_relation (dl#entity,dl#entity)
           supertype:  dl#conceptual_relation (dl#entity,dl#entity)
              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


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