Document what's actually in use, not just what's formally adopted
Quote
Hey, these are not things that have been formally adopted into the namespace XML and s document, but these are other tags that are in the wild that use the podcast namespace. So they here are some. Here are some other examples of tags that we have seen that we know are in use,
Episode 196: Red Neck Airforce (episode page, opens in a new tab) 01:05:38 (play audio from this timestamp, opens in a new tab)
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Summary
As people create their own podcast-namespace tags, Dave proposes a spec 'appendix' listing tags seen in the wild that aren't formally adopted, so developers know what they might run into. As long as everyone works from the same reference implementation, everyone can read the same data.