Obscure technical quibble of the day follows. Warning: technogeeking ahead.
Dave Winer’s OPML sharing guidelines are a little wonky. Point 1 says:
If an element is pointing to a feed, set its type to “rss”. Do this even if it’s not an RSS feed.
Nope. Set the type to “rss” if it’s an RSS feed. Set it to “atom” if it’s an Atom feed. If you want a generic type name for a feed, I’d suggest “feed”.
Note on the below — NetNewsWire already produces OPML that tags feeds as type “rss”. Reverse compatibility nearly requires others…