I have often stated (1, 2, 3) that there are 7 different and incompatible versions of RSS. This was based on an embarassingly simple formula: I counted the version numbers in use (0.90, 0.91, 0.92, 0.93, 0.94, 1.0, and 2.0) and came up with the number "7". But recently some people have taken to clai
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http://diveintomark.org/archives/2004/02/04/incompatible-rss
