Bib context set - part index modifiers

["Ray Denenberg, Library of Congress" <rden@loc.gov>]

From: "Nick Nicholas" <opoudjis@optushome.com.au>

> I can see a use for part index modifiers. Journals often have "New  
> series" for their issue numbers, indicating they've started counting   
> from 1 again; the current scheme does not differentiate between new   
> series and old series numbering. (The alternative is to make "1 NS" a   
> distinct bib.volume index entry from "1".)

What do you do if they start counting over yet again (a third time)?

--Ray