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If your question was asking how to break a long list into groups then the 'Alternate nodes'/'Split a long list into groups' on the faq shows that.
Hope that helps.
will both create output strings.
would determine if there is description in the rss xml but I know too little about rss to know this is the best approach. I expect the xpath would also depend which version rss your looking at.
The RSS forum [webmasterworld.com] might know better, although there's not much XSL talked there.