(Almost) anything you see in the headlines buffer can also be accessed
and syndicated further via a generated feed (in Atom format) by clicking the little
feed icon at the right of the currently loaded feed title; in version:1.12 next to the feed list near the top.
1.12 and newer
You can access labels, categories, tags, search results as RSS feeds.
Since version:1.5.0 you can also limit the articles which go into
generated feeds, e.g. you can have a generated feed which includes
published articles from category X.