You might think we agree, but we don't. See elsewhere. Neither "XML" (nor "RSS") belong in any definition of "podcast" (unless it's to say something like "[..

You might think we agree, but we don't. See elsewhere. Neither "XML" (nor "RSS") belong in any definition of "podcast" (unless it's to say something like "[...] often delivered via RSS", but at that point you're not really talking about the defining characteristic of it if it's optional).