Question: What is the syntax of <itunes:block>?
Answer: If there is a block AND the value is “yes” case-insensitive: <itunes:block>yes</itunes:block> Then the value is considered true.
You can’t imagine how much it pleases me to see that, the answer specifically and the process generally. Well done, Ernie, and thank you.
If you are interested in and concerned about how Apple products produce and consume RSS, in Safari or iTunes or Garageband or the Chapter Tool, you now have an opportunity and a responsibility: get on the list (and please, be nice: remember, this is Apple, not Microsoft ;)).
(I’m pretty sure Sam will have written a fairly similar post by now, but I purposely didn’t look first, to see how close we would come. Bet he doesn’t have the “Gee, I weally wish that Apple wouldn’t do that.” quote, though.)