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What's the difference between RSS and Atom newsfeeds?

Asked by artificialard (2273points) October 26th, 2008

I use Firefox and click on that little blue RSS icon in the address bar to add feeds to my RSS reader (NetNewsWire). Sometimes when I want to add a feed there are choices between RSS, Atom, and even multple versions (i.e. RSS 2.0).

What’s the difference to the reader? They seem to work the same and all the guides to the differences seem aimed at feed providers, not consumers.

Why would a feed reader care whether something is RSS or Atom, or some version variation therein??

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