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 This utility can be called from a CLIST to evaluate relative GDG generation
 numbers for a dataset, and convert them into "GOOVOO's" to enable the CLIST to
 process the dataset.  When you invoke GDGGEN you pass the keyword parm "DSN".
 GDGGEN will then VPUT the following variables into the SHARED pool.
 
 LIMIT - The number of generations allowed for this GDG index.
 
 NEXTGEN - The GOOVOO for the "+1" version of the dataset.
 
 MINUS0 thru MINUS999 (where 999 = the LIMIT of this index) - The GOOVOO for
 each relative generation number on the index.