Relation dl#has_member__hasmember (dl#entity,dl#entity)
  inverse:  dl#member_of
  supertype:  dl#constituted_by__constitutedby__substance___K__k (dl#entity,dl#entity)
     supertype:  dl#immediate_relation__immediaterelation (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
     supertype:  pm#constitution (?,?)
        supertype:  pm#partial_ordering_relation (?,?)  this category only serves structuration purposes: it is instance of pm#partial_ordering_relation_type which is not instance of pm#class_of_inheritable_relation_type
           supertype:  pm#reflexive_relation__reflexiverelation (?,?)  this category only serves structuration purposes: it is instance of pm#reflexive_relation_type which is not instance of pm#class_of_inheritable_relation_type
              supertype:  pm#binary_relation_with_particular_mathematical_property (?,?)
                 supertype:  pm#relation_with_particular_mathematical_property (*)
                    supertype:  pm#relation_with_particular_property (*)  this rather fuzzy type permits to group categorization schemes less common than those covered by the previous sibling categories
                       >part of:  pm#relation__related_thing__relatedthing___related_with  type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type
           supertype:  pm#antisymmetric_relation__antisymmetricrelation (?,?)  this category only serves structuration purposes: it is instance of pm#antisymmetric_relation_type which is not instance of pm#class_of_inheritable_relation_type
              supertype:  pm#binary_relation_with_particular_mathematical_property (?,?)
           supertype:  pm#transitive_relation (?,?)  this category only serves structuration purposes: it is instance of pm#transitive_relation_type which is not instance of pm#class_of_inheritable_relation_type
              supertype:  pm#binary_relation_with_particular_mathematical_property (?,?)