Relation higgins#negativeInteger (higgins#NegativeInteger,xsd#negativeInteger)
  supertype:  higgins#simpleValue (higgins#SimpleValue,higgins#DigitalSubject)
     supertype:  higgins#simpleMetadata (higgins#Value,higgins#DigitalSubject)  Used as the super-Property of some DatatypeProperties whose domain is higgins#ValeAndMetadata or higgins#DigitalSubject to indicate that these properties are considered to be metadata about the ValueAndMetadata (or DigitalSubject)
        supertype:  pm#Higgins_datatype_property (?,?)
           supertype:  pm#Higgins_property (?,?)
              supertype:  pm#relation_coming_from_an_ontology (*)
                 supertype:  pm#relation_for_an_application (*)  relation introduced by an application
                    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
                       supertype:  pm#relation__related_thing__relatedthing___related_with (*)  type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type


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