pm#Higgins_Attribute_or_Value
  supertype:  pm#Higgins_object
  subtype:  higgins#Value
     subtype:  higgins#SimpleValue
        subtype:  higgins#String
        subtype:  higgins#Base64Binary
        subtype:  higgins#NormalizedString
        subtype:  higgins#DateTime
        subtype:  higgins#Boolean
        subtype:  higgins#Decimal
        subtype:  higgins#Integer
        subtype:  higgins#NegativeInteger
        subtype:  higgins#NonNegativeInteger
        subtype:  higgins#PositiveInteger
        subtype:  higgins#NonPositiveInteger
        subtype:  higgins#Float
        subtype:  higgins#Double
        subtype:  higgins#Long
        subtype:  higgins#Int
        subtype:  higgins#Short
        subtype:  higgins#Byte
        subtype:  higgins#UnsignedLong
        subtype:  higgins#UnsignedInt
        subtype:  higgins#UnsignedShort
        subtype:  higgins#UnsignedByte
        subtype:  higgins#HexBinary
        subtype:  higgins#Time
        subtype:  higgins#Date
        subtype:  higgins#GYear
        subtype:  higgins#GYearMonth
        subtype:  higgins#GMonthDay
        subtype:  higgins#GDay
        subtype:  higgins#GMonth
        subtype:  higgins#AnyURI
        subtype:  higgins#Token
        subtype:  higgins#Language
        subtype:  higgins#NMTOKEN
        subtype:  higgins#Name
        subtype:  higgins#NCName
     subtype:  higgins#ComplexValue
        subtype:  higgins#SubjectRelationship
           subtype:  pwa#Person
     subtype:  higgins#TimeSpan
  subtype:  higgins#Attribute  Instances of this class are used as the domain of higgins:metadata properties that, taken together, are considered to be the metadata about a higgins:attribute sub-property.
     subtype:  higgins#ComplexAttribute
        subtype:  pwa#PostalAddress
     subtype:  higgins#NormalizedStringAttribute
        subtype:  higgins#NormalizedStringSimpleAttribute

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