Enclosure type parameters
Duncan Mackenzie: FeedValidator.org tells me that the main MSDN feed (http://msdn.microsoft.com/rss.xml) is invalid, because we have enclosures with a MIME type of type="text/html; charset=utf-8", but I believe that is a valid value...
It appears that I will never be done learning. I had assumed that charset was a Content-Type header parameter, instead such parameters are considered part of the media type.