Relation higgins#simpleValue (SimpleValue,DigitalSubject)
  supertype:  simpleMetadata  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)
  subtype:  string (String,string)
  subtype:  normalizedString (NormalizedString,normalizedString)
  subtype:  base64Binary (Base64Binary,base64Binary)
  subtype:  integer (Integer,integer)
  subtype:  dateTime (DateTime,dateTime)
  subtype:  boolean (Boolean,boolean)
  subtype:  decimal (Decimal,decimal)
  subtype:  nonNegativeInteger__nonnegativeinteger (NonNegativeInteger,nonnegative_integer)
  subtype:  positiveInteger (PositiveInteger,positiveInteger)
  subtype:  nonPositiveInteger__nonpositiveinteger (NonPositiveInteger,nonPositiveInteger)
  subtype:  negativeInteger (NegativeInteger,negativeInteger)
  subtype:  float (Float,float)
  subtype:  double (Double,double)
  subtype:  long (Long,long)
  subtype:  int (Int,int)
  subtype:  short (Short,short)
  subtype:  byte (Byte,byte)
  subtype:  unsignedInt (UnsignedInt,unsignedInt)
  subtype:  unsignedLong (UnsignedLong,unsignedLong)
  subtype:  unsignedShort (UnsignedShort,unsignedShort)
  subtype:  unsignedByte (UnsignedByte,unsignedByte)
  subtype:  hexBinary__hexbinary (HexBinary,hexBinary)
  subtype:  time (Time,time)
  subtype:  date (Date,date)
  subtype:  gYear__gyear (GYear,gYear)
  subtype:  gYearMonth__gyearmonth (GYearMonth,gYearMonth)
  subtype:  gMonthDay (GMonthDay,gMonthDay)
  subtype:  gDay__gday (GDay,gDay)
  subtype:  gMonth__gmonth (GMonth,gMonth)
  subtype:  anyURI (AnyURI,anyURI)
  subtype:  token (Token,token)
  subtype:  nMTOKEN (NMTOKEN,NMTOKEN)
  subtype:  language (Language,language)
  subtype:  name (Name,Name)
  subtype:  nCName (NCName,NCName)