If you use Feed Validator to check up on your feed's formatting and validity, you may have seen this error message:
So, what should you do about it?
The short answer is: nothing. Although the Atom (which is one flavor of feed, like RSS) specification has been updated, all of the major services and applications -- including FeedBurner -- still understand the older version.
Better yet, by using FeedBurner, you can make sure that your feed is always delivered in the most appropriate, compatible format to your readers. Our SmartFeed service automatically decides which format is best for the reader requesting your feed, so you don't have to worry about sending down obsolete formats.