What’s Like RSS? (OPML version)

For a while I’ve thought Dave Winer’s What’s Like RSS? question needed to be developed further.

Perhaps some kind of outline / catalogue of open formats that are well-established, have no “owner” but multiple existing stake-holders, and are unlikely to change at any time in the near future.

Anyway, I thought one should exist, so here’s the first draft up on GitHub … for anyone who wants to add to it.