If I was exposing an RSS feed of a TV channel to you, what would you need in the feed to make the show times usable? 

Currently building an RSS feed of featured shows for an offshore broadcaster.

Thinking it makes sense to include broadcast time data. But not having much luck finding a sensible RSS namespace to use.

RSS-TV looked promising but the actual schema is 404'd and the site's last updates are 2008.

http://www.rss-tv.org/
http://www.rss-tv.org/rss/tv1.0
http://www.rss-tv.org/documentation.html

The last link looks promising (<tv:start> container in particular) ... but what are people really using?