The UPDATE command allows you to attach more recent versions of
    elements to your own collections, records, or fields. In this
    way, you can access the work of others in your working group.

    Before you issue the UPDATE command, you must reserve the
    elements you wish to update. The SHOW RESERVATIONS command
    indicates whether this condition exists.

    When you issue the UPDATE command, the action that occurs depends
    on the keyword you specified in the DEFAULT_ATTACHMENT clause of
    the DEFINE CONTEXT or the CHANGE CONTEXT command for your current
    context. The following table lists the keywords and behaviors
    associated with them:

    DEFAULT_
    ATTACHMENT
    Keyword          Behavior

    LATEST           Detaches the version currently attached and
                     attaches the latest version, whether checked in
                     or ghost. This keyword is the default attachment
                     method.

    LATEST_CHECKIN   Detaches the version currently attached and
                     attaches the version most recently checked in.

    SPECIFIC_        Does not detach the version currently attached.
    VERSION

    The UPDATE command cannot attach a ghost version created with
    another context. The UPDATE command also cannot attach a checked-
    in version unless you have write privilege for the partition
    where the version resides.