Relation higgins#simpleValue (higgins#SimpleValue,higgins#DigitalSubject)
  subtype:  higgins#string  higgins#normalizedString  higgins#base64Binary  higgins#integer  higgins#dateTime  higgins#boolean  higgins#decimal  higgins#nonNegativeInteger  higgins#positiveInteger  higgins#nonPositiveInteger  higgins#negativeInteger  higgins#float  higgins#double  higgins#long  higgins#int  higgins#short  higgins#byte  higgins#unsignedInt  higgins#unsignedLong  higgins#unsignedShort  higgins#unsignedByte  higgins#hexBinary  higgins#time  higgins#date  higgins#gYear  higgins#gYearMonth  higgins#gMonthDay  higgins#gDay  higgins#gMonth  higgins#anyURI  higgins#token  higgins#nMTOKEN  higgins#language  higgins#name  higgins#nCName
  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
                    >part of:  pm#relation__related_thing__relatedthing___related_with  type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type