Blogger XML Site Feed?

When I "publish entire site" for the previous post, I discover that one more file: atom.xml is generated. As I'm as curious as a cat, I entered http://minghong.blogspot.com/atom.xml into the location bar. Know what? A formatted XML is displayed right in front of my eyes...!

It seems that this "Atom" formatted XML is somehow like RSS Feed, but just the format is different.