daml#same_class_as (rdfs#class,rdfs#class)  in WebKB, use the link '='
  exclusion:  owl#equivalent_property
  equal:  owl#equivalent_class (owl)
  supertype:  pm#relation_to_another_class (rdfs#class,rdfs#class+)
     supertype:  pm#relation_from_class_to_collection (rdfs#class,pm#collection)
        supertype:  pm#relation_from_type_to_collection (pm#type,pm#collection)
           supertype:  pm#relation_between_collections (pm#collection,pm#collection+)
              supertype:  pm#relation_from_collection (pm#collection,*)
                 supertype:  pm#relation_from/to_thing_of_common_kind (*)  this type permits to categorize relations according to their signatures and hence offers (i) a concise way to set essential exclusion relations, and (ii) a systematic and easy-to-follow categorization
                    >part of:  pm#relation__related_thing__relatedthing___related_with  type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type
                 supertype:  pm#what_relation (*)
                    supertype:  pm#wh-/how_relation (*)  this type permits to categorize relations according to the usual who/what/why/where/when/how questions ; this is a traditional but very subjective and ineffective 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#relation_to_collection (*,pm#collection)
                 supertype:  pm#relation_from/to_thing_of_common_kind (*)  this type permits to categorize relations according to their signatures and hence offers (i) a concise way to set essential exclusion relations, and (ii) a systematic and easy-to-follow categorization
                 supertype:  pm#what_relation (*)
           supertype:  pm#relation_from_type (pm#type,*)  type of relations from a concept/relation type, i.e. in RDFS terminology, from a class or a property
              supertype:  pm#relation_from_collection (pm#collection,*)
        supertype:  pm#relation_from_class (rdfs#class,*)
           supertype:  pm#relation_from_type (pm#type,*)  type of relations from a concept/relation type, i.e. in RDFS terminology, from a class or a property
     supertype:  pm#relation_to_another_set_or_class (pm#set_or_class,pm#set_or_class+)  this category is needed to group SUMO relations between classes which cannot be subtype of pm#relation_from_type because their signatures curiously also involve sets
        supertype:  pm#relation_between_collections (pm#collection,pm#collection+)
        supertype:  pm#relation_to_set_or_class (*,pm#set_or_class)
           supertype:  pm#relation_to_collection (*,pm#collection)
  supertype:  pm#same_type_as (pm#type,pm#type)
     supertype:  pm#relation_from_type (pm#type,*)  type of relations from a concept/relation type, i.e. in RDFS terminology, from a class or a property
     supertype:  owl#same_as (?,?)  MORE PRECISE TYPES THAN THIS ONE SHOULD BE USED
        supertype:  pm#equal (?,?)  "=" in KIF; true if the 1st argument is identical to the 2nd
           supertype:  pm#equivalence_relation__equivalencerelation (?,?)  this category only serves structuration purposes: it is instance of pm#equivalence_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#symmetric_relation__symmetricrelation (?,?)  this category only serves structuration purposes: it is instance of pm#symmetric_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 (?,?)


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