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From RSS to Atom
(susam.net)
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It wasn't a switch per se. The same people that used to get the RSS feeds continue to get them, but as atom.
All subscribers may see more content for this feed in their reader, but they won't have to change anything on their end, in order to continue getting the feed.
Unfortunately, IIRC, some feed readers only support RSS, not Atom. Those users may see some warning like "invalid format".
Are RSS and Atom not supposed to be interchangeable?
Tbh, i never really paid attention which one i was subscribing to, it always worked.
They are totally different format: different structure, different keyword, different time date format, different escape way, different language specifying way...
Their common parts are only both used for feed and both use XML.
And even more, interoperability of RSS 2.0 itself is horrible, RSS 2.0 standard left too many details in not specified situation, such as how to deal with relative URL...
For more infomation, you can read https://www.intertwingly.net/wiki/pie/Rss20AndAtom10Compared
i had it completely wrong the whole time, i actually thought Atom was kind of a fork from the frozen RSS 2.0. That it had the same structure, just with more fields - to put it simply, RSS 2.0 with more features.