Syntax:

      /TYPE = (type-specification [, type-specification]...)

  Use /TYPE to specify a particular type  of  dictionary  directory  or
  object whose history lists you want to purge.

  A type specification names a type, such as DTR$DOMAIN or  CDD$RECORD,
  whose  history  list  entries  are  to  be  deleted.  You can use the
  wildcard characters % and * in a type specification.  The parentheses
  are optional if you specify only one type.