Had to provide an RSS feed for a project - put together a view that generates an XML document, and set up a template with a multimedia handler; works fine. Using ORDS 21.1.3.r1531102.
The RSS page checks out ok (w3C validator), but one of my target users is the campus cable TV system, which ran read an RSS feed - BUT - needs the URL to end in .xml. When I try to add that to the template "rss" => "rss.xml", it complains about illegal characters.