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A GDG is usually cataloged.<ref name=G.sets/>
An individual member of the GDG collection is called a "''Generation Data Set''."<ref name=G.sets/><ref>"A generation data set is one of ...</ref> The latter may be identified by an absolute number, {{code|ACCTG.OURGDG(1234)}}, or a relative number: (-1) for the previous generation, (0) for the current one, and (+1) the next generation.<ref>{{cite web
|url=http://mainframewizard.com/content/what-gdg |title=What is a GDG?}}</ref>
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