higgins#DigitalSubject
  supertype:  pm#Higgins_ContextObject_or_DigitalSubject (pm)  pm#Higgins_DigitalSubject_or_Value (pm)
  higgins#uniqueIdentifier:  higgins#String [*,49]
  higgins#simpleValue of:  higgins#SimpleValue [49..*,*]
  subtype:  xsd#boolean
  subtype:  xsd#date
  subtype:  xsd#dateTime
  subtype:  xsd#normalizedString
  subtype:  pm#string  a string of characters
     subtype:  rdfs#XML_literal
        subtype:  rdfs#Literal
           subtype:  pm#name_string
     subtype:  sumo#character  element of an alphabet, a set of numerals, etc.; sumo#character is a subclass of sumo#symbolic_string, because every instance of sumo#character is an alphanumeric sequence consisting of a single element
  subtype:  xsd#base64Binary
  subtype:  sumo#integer  a negative or nonnegative whole number
     subtype:  sumo#nonnegative_integer__nonnegativeinteger  integer >= 0
        subtype:  sumo#positive_integer  integer > 0
        subtype:  kif#zero  class containing only 0
     subtype:  sumo#negative_integer  integer < 0
     subtype:  sumo#even_integer  integer that is evenly divisible by 2
     subtype:  sumo#odd_integer__oddinteger  integer that is not evenly divisible by 2
     subtype:  sumo#prime_number__primenumber
  subtype:  xsd#decimal
  subtype:  sumo#nonnegative_integer__nonnegativeinteger  integer >= 0
  subtype:  xsd#positiveInteger
  subtype:  xsd#nonPositiveInteger__nonpositiveinteger
  subtype:  xsd#negativeInteger
  subtype:  xsd#float
  subtype:  xsd#double
  subtype:  xsd#long
  subtype:  xsd#int
  subtype:  xsd#short
  subtype:  xsd#byte
  subtype:  xsd#unsignedLong
  subtype:  xsd#unsignedInt
  subtype:  xsd#unsignedShort
  subtype:  xsd#unsignedByte
  subtype:  xsd#hexBinary__hexbinary
  subtype:  xsd#time
  subtype:  xsd#gYear__gyear
  subtype:  xsd#gYearMonth__gyearmonth
  subtype:  xsd#gMonthDay
  subtype:  xsd#gDay__gday
  subtype:  xsd#gMonth__gmonth
  subtype:  xsd#anyURI
  subtype:  xsd#token
  subtype:  xsd#NMTOKEN
  subtype:  xsd#language
  subtype:  xsd#Name
  subtype:  xsd#NCName
  subtype:  pwa#Person

1 statement is about an indirect instance of higgins#DigitalSubject (pwa#Person): pm#graph1_on_Person
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