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