Message
Missing recommended iTunes parent element: child
Explanation
In order to submit your feed to iTunes, there are a number of elements which should be present, including <language>, <itunes:category>, and <itunes:explicit>.
If you are including iTunes elements in your Atom feed, add an
xml:lang attribute to the feed element to satisfy
the language requirement.
<feed xmlns='http://www.w3.org/2005/Atom' xmlns:itunes='http://www.itunes.com/dtds/podcast-1.0.dtd' xml:lang='en-US'>
Solution
Consider adding the recommended element.
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