The SHOW VERSION command displays the following information about
    one or more respositories that you have invoked and to which the
    CDO session is currently attached:

    o  Version number of Oracle CDD/Repository that is installed on
       your system

    o  Major and minor version numbers of each repository

    o  Fully qualified name of each repository

    o  Version numbers of Oracle CDD/Repository with which each
       repository is compatible

    If you issue the SHOW VERSION command and you have not invoked a
    repository during the CDO session, CDO displays only the version
    of Oracle CDD/Repository that is currently installed.

    Commands such as DEFINE FIELD or SHOW FIELD will invoke a
    repository; however, the SET DEFAULT or SHOW DEFAULT commands
    will not. If you issue a DIRECTORY command and the repository
    contains elements, the session will invoke a repository.