CDD/Repository supports information in two formats:

   o  Metadata manipulated with the Common Dictionary Operator (CDO)

      Oracle CDD/Repository continues to support dictionaries created by
      previous versions of CDD/Plus.  You can continue to work with these
      dictionaries without taking advantage of new features.  A CDO
      dictionary is created on your system when you install Oracle
      CDD/Repository.

   o  Metadata manipulated with the Dictionary Management Utility (DMU)

      CDD/Plus continues to support dictionaries created by older
      versions of the CDD and the utilities that manipulate those
      dictionary definitions---DMU, CDDL, and CDDV.

      If a DMU dictionary does not already exist on your system, Oracle
      CDD/Repository creates one during the installation procedure.  The
      installation also installs the compatibility repository, a special
      overlapping CDO dictionary that coordinates DMU format definitions
      and CDO format definitions.

      You manipulate DMU dictionary definitions through the DMU utility;
      however, you can also read DMU definitions through CDO.

  For the most part, the features of Oracle CDD/Repository do not affect
  dictionaries that were created by earlier versions of the CDD.  This
  means that you can continue to access established DMU dictionaries with
  products such as DATATRIEVE and ACMS.

  Oracle CDD/Repository provides the DMU, CDDL, and CDDV utilities in
  addition to the CDO utility so you can perform all your dictionary work
  as with previous releases of CDD.  In addition, Oracle CDD/Repository
  automatically translates definitions in existing dictionaries so that
  you can read them from the CDO interface.

  For more information on the features of DMU dictionaries, see the help
  topics "DMU", "CDDL", and "CDDV".