1.CDO>  SHOW DEFAULT
      CDO>  SHOW VERSION
      Installed version of Oracle CDD/Repository is V7.0.1

      In this example, the SHOW DEFAULT command does not invoke
      a repository. Therefore, the SHOW VERSION command displays
      only the version of Oracle CDD/Repository that is currently
      installed.

    2.CDO>  SHOW FIELD
      Definition of field A1
      |   Datatype                 text size is 1 characters
      |   Row_major array          1:4
      Definition of field A1_KEY
      |   Datatype                 text size is 1 characters
         .
         .
         .
      CDO> SHOW VERSION
      Installed version of Oracle CDD/Repository is V7.0.1
      Attached to repository
      CDD$R0:[SMITH.REPOS3]
      Repository Version V6.1 / V7.0.1
      Internal Major Version 26
      Internal Minor Version 3

      In this example, the SHOW FIELD command invokes a repository.
      Consequently, the SHOW VERSION command displays information
      about the repository to which it is attached.