Relation pm#same_type_as (pm#type,pm#type)
supertype: pm#relation_from_type owl#same_as (owl)
equal: dl#equal (pm)
subtype: owl#equivalent_class (rdfs#class,rdfs#class) in WebKB, use the link '='
subtype: owl#equivalent_property (pm#binary_relation_type,pm#binary_relation_type) in WebKB, use the link '='