higgins#SimpleValue
  supertype:  Value
  simpleValue:  DigitalSubject [*,49..*]
  subtype:  String
  subtype:  Base64Binary
  subtype:  NormalizedString
  subtype:  DateTime
  subtype:  Boolean
  subtype:  Decimal
  subtype:  Integer
  subtype:  NegativeInteger
  subtype:  NonNegativeInteger
  subtype:  PositiveInteger
  subtype:  NonPositiveInteger
  subtype:  Float
  subtype:  Double
  subtype:  Long
  subtype:  Int
  subtype:  Short
  subtype:  Byte
  subtype:  UnsignedLong
  subtype:  UnsignedInt
  subtype:  UnsignedShort
  subtype:  UnsignedByte
  subtype:  HexBinary
  subtype:  Time
  subtype:  Date
  subtype:  GYear
  subtype:  GYearMonth
  subtype:  GMonthDay
  subtype:  GDay
  subtype:  GMonth
  subtype:  AnyURI
  subtype:  Token
  subtype:  Language
  subtype:  NMTOKEN
  subtype:  Name
  subtype:  NCName

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