higgins#SimpleValue
  subtype:  String  Base64Binary  NormalizedString  DateTime  Boolean  Decimal  Integer  NegativeInteger  NonNegativeInteger  PositiveInteger  NonPositiveInteger  Float  Double  Long  Int  Short  Byte  UnsignedLong  UnsignedInt  UnsignedShort  UnsignedByte  HexBinary  Time  Date  GYear  GYearMonth  GMonthDay  GDay  GMonth  AnyURI  Token  Language  NMTOKEN  Name  NCName
  simpleValue:  DigitalSubject [*,49..*]
  supertype:  Value
     supertype:  Higgins_DigitalSubject_or_Value
        supertype:  Higgins_object
           supertype:  particular  a 0-order type
              supertype:  individual__particular___supertype_of_1st_order_types  all individuals (for concepts or relations) are implicitely or explicitely instance of that type
                 supertype:  thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
     supertype:  Higgins_Attribute_or_Value
        supertype:  Higgins_object

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