title + link + description
the only mandatory ﬁelds in RSS are title, link, and description — which makes it an
extremely ﬂexible format. The only problem is that aggregators have to do a lot of
guesswork about what’s in it.
this was complicated by the various ﬂavors of RSS (0.9, 0.91, 0.92, 0.93, 2.0 et al)