CDO (Common Dictionary Operator) is an interactive utility that allows
  you to define and manage CDO dictionaries, define data definitions,
  perform pieces tracking, and verify and fix dictionaries.

  In the CDO environment, you can accomplish all the data description,
  administration, and dictionary management functions.  In addition, a
  flexible menu-driven editor allows you to easily create and modify
  field and record definitions.  For more information about CDO, type:

   $ REPOSITORY OPERATOR

  Then, from the CDO> prompt, type HELP to display information on
  specific CDO commands.

1  –  CDO Foreign Command

  You can invoke CDO as a foreign Digital Command Language (DCL) command.
  At the DCL prompt, type REPOSITORY OPERATOR and any CDO command.  After
  the CDO command executes, you automatically return to the DCL prompt.

  Before invoking CDO with the REPOSITORY OPERATOR command, make sure
  that your CDD$DEFAULT is set to the CDO dictionary that you want to
  work in.  You cannot override your CDD$DEFAULT by using the REPOSITORY
  OPERATOR command.

  You can use the hyphen ( - ) to continue a CDO command that extends
  beyond one line.

  The following command creates the field definition MIDDLE_INITIAL in
  your default dictionary:

  $ REPOSITORY OPERATOR DEFINE FIELD MIDDLE_INITIAL -
  _$ DATATYPE IS TEXT SIZE IS 1.
  $

2  –  Japanese Input Method

  Oracle CDD/Repository supports a Japanese input method to the CDO
  interface using the Japanese screen management library (Japanese SMG),
  which is provided by the Japanese OpenVMS operating system.

  The following logical definitions are required to invoke the Japanese
  SMG in CDO:

          Logical Names to Invoke Japanese SMG
  ------------------------------------------------------
    Logical Name              Equivalence Name
  ------------------------------------------------------
    CDD$SMGSHR                SYS$LIBRARY:JSY$SMGSHR
    CDD$SMG_CHARACTER_SET     KANJI
  ------------------------------------------------------

  When you do not use the Japanese input method in CDO, assign the
  following logical name:

         Logical Names to Invoke English SMG
  ------------------------------------------------------
   Logical Name              Equivalence Name
  ------------------------------------------------------
   CDD$SMGSHR                SYS$LIBRARY:SMGSHR
  ------------------------------------------------------

  To run CDO, the CDD$SMGSHR logical name must point an existing SMG
  image.  Be sure that the logical name, CDD$SMGSHR, is defined correctly
  before you use CDO.

3  –  Japanese Help Error Msgs

  Oracle CDD/Repository provides Japanese CDO help and error messages.
  To use Japanese CDO help and messages, assign the following logical
  names:

        Logical Names For Japanese CDO Help and CDO Messages
  -----------------------------------------------------------------
                      Logical Name      Equivalence Name
  -----------------------------------------------------------------
     Help:            CDO$HELP          SYS$HELP:JCDO$HELP
     CDO messages:    CDO$MESSAGES      SYS$MESSAGE:JCDO$MESSAGES
  -----------------------------------------------------------------

  When you read Japanese CDO messages, set the character_set of your
  session to DEC_KANJI using the CDO SET CHARACTER_SET command;
  otherwise, some Japanese messages may not display correctly.

  To read Japanese help and messages you must use a Japanese virtual
  terminal, or use Japanese DECwindows, which provides a Japanese
  terminal emulator.

  To read English CDO help and CDO messages, deassign the logical names
  or assign the following logical names:

       Logical Names For English CDO Help and CDO Messages
  -----------------------------------------------------------------
                     Logical Name      Equivalence Name
  -----------------------------------------------------------------
    Help:            CDO$HELP          SYS$HELP:CDO$HELP
    CDO messages:    CDO$MESSAGES      SYS$MESSAGE:CDO$MESSAGES
  -----------------------------------------------------------------

4  –  Session Character Set

  Specifies the valid characters that you can use for an element name,
  the initial value field property, and in comments.  You must set the
  character_set of the session to DEC_KANJI when you use Japanese with
  Oracle CDD/Repository.

  Use the CDO SET CHARACTER_SET command to set the session character_set
  of the current CDO session.  For example:

  CDO> SET CHARACTER_SET DEC_KANJI

  If you omit the CDO SET CHARACTER_SET command, Oracle CDD/Repository
  references the equivalence name of the CDD$CHARACTER_SET logical name
  as the session character_set.  If this logical name is not assigned,
  Oracle CDD/Repository defaults to DEC_MCS.

  The following table lists the valid character_set names for
  character_set:

     Valid Character_set Names for the Session Character_set
  ------------------------------------------------------------------
   Character_set   Character_set    Description
                   Name
  ------------------------------------------------------------------
   MCS             DEC_MCS          A set of international
                                    alphanumeric characters

   Kanji+ASCII     DEC_KANJI        Japanese characters as defined
                                    by the JIS X0208:1990 standard,
                                    Narrow Katakana characters, as
                                    defined by the JIS X0201:1976
                                    standard, and ASCII characters
  ------------------------------------------------------------------

  To display the character_set of the current session, use the CDO SHOW
  CHARACTER_SET command.  For example:

  CDO> SHOW CHARACTER_SET
  Session Character_set is DEC_MCS