Mark Pilgrim summarizes the design debate within the Atom standards group with respect to globally-unique identifiers for content. They’re using URIs, which is an interesting choice, and not at all as simple as you might expect (when I confronted a similar problem with a content product I wrote a few years back, I used guids, because they’re easy to deal with on Windows; the Atom group examined and discarded guids — for good reasons, I think).
Bottom line, Atom will require that publishers (as opposed to clients) do the heavy lifting with respect to what a valid URI is. As Marc says:
Making publishers normalize the URI ahead of time takes away that surprise, and lets clients do what they thought they could do in the first place. You can’t do that with RSS. Really Simple Syndication is really only simple if you’re doing it incorrectly.
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