The MERGE command creates a merge relationship between a branch
    line version and a new version on the originating line of
    descent. Both versions must be controlled.

    If the versions are of type MCS_TEXT, CDO also performs a
    physical merge that incorporates the highest versions on both
    lines of descent. If the versions are of another type, you must
    perform the physical merge yourself with an editor appropriate to
    your system. If you are familiar with the Oracle CDD/Repository
    callable interface, you can write a method to perform the
    physical merging.

    When you issue the MERGE command, your collection must include
    the version on the originating line, rather than the version
    on the branch line. If your collection includes the branch line
    version, issue the DETACH FROM COMPOSITE and ATTACH TO COMPOSITE
    commands to attach to the highest version on the originating
    line. You must reserve this version before you issue the MERGE
    command.