Why Atom?

同事問我一個好問題：Atom跟RSS有什麼不同？

找了一下，在 Atom Wiki 的 Motivation 有很詳細的說明與延伸閱讀：

Why are you doing this? RSS is over five years old. It was designed for news sites, a way for them to list the stories they had. Things are different now, and RSS is mostly used as a way of sending around the content of weblogs. RSS has been kludged and pushed into this world, but it doesn't really fit.

另可參考：xml.com - The Atom API