crm.fsf.org/20131203/files/sites/all/modules-new/views/help/style-rss.html

   1 The <strong>RSS</strong> output style is only available for <em>Feed</em> display types. It will display the view as an RSS feed, which is a specialized XML output. This output is not user visible, but can be parsed by feed readers for aggregation.
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   3 You may supply a description for the RSS feed; most feed readers will display this description along with the contents of the feed. You may also select to use the site's mission statement for the description.
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   5 Please note that when using RSS views only comes with the one RSS style. There's no style override for RSS.  Modules can add more.