From this article:
http://en.wikipedia.org/wiki/Atom_%28standard%29

I have:
<id>http:/mysiteaddress/</id>
<title>mytitle</title>
<updated>2012-05-26T20:05:00Z</updated>
<link href="http://mysitetitle/" rel="self" />
<link href="http://www.mysitetitle.com/" />

It validates though with warning: Self reference doesn't match document location (in links).
The .xml file is in same directory as the site index.
What needs correcting?

Thanks