Description

   The DELETE GENERATION command removes information about one or
   more generations of an element. Once a generation is deleted, it
   cannot be restored to its former place in the element in the CMS
   library. You can, however, archive the contents of the generation
   using the /ARCHIVE qualifier and later restore the contents of the
   generation.

   If the generation or range of generations to be deleted has a
   direct descendant generation (that is, a descendant generation on
   the same line of descent), then the changes associated with those
   generations are combined, and then those changes are combined
   with the changes in the descendant generation. If there is
   no descendant generation, that is, the generation or range of
   generations to be deleted is at the end of the line of descent,
   then the changes associated with those generations are discarded.

   You can specify a single generation with the /GENERATION
   qualifier. /GENERATION=1+ is the default. You can also specify
   a range of generations with either the /AFTER or /FROM qualifier
   to delimit the beginning of a range, and either the /BEFORE or /TO
   qualifier to delimit the end of a range. These sets of qualifiers
   can be paired to specify ranges with inclusive or exclusive
   endpoints (see the restriction section).

   If you delete the latest generation on the main line of descent of
   an element that has the reference copy attribute, CMS deletes the
   generation's reference copy and creates a new reference copy that
   corresponds to the generation that is now the latest generation on
   the main line of descent.