Relation pm#Higgins_datatype_property (?,?)
  supertype:  Higgins_property
  subtype:  simpleMetadata (Value,DigitalSubject)  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:  subjectId__subjectid (SubjectRelationship,normalizedString)
        subtype:  subjectCUID (SubjectRelationship,normalizedString)
     subtype:  validFrom__validfrom (TimeSpan,date)
     subtype:  validTo__validto (TimeSpan,date)
     subtype:  lastModified (Value,dateTime)
     subtype:  syncConflict (Value,boolean)
     subtype:  lastVerifiedFromSource (Value,date)
     subtype:  lastVerifyAttempt (Value,date)
     subtype:  creationTime (Value,date)
     subtype:  simpleValue (SimpleValue,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)