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Technically yes, although it may not be respected. > Elements from other namespaces may be included pretty much anywhere. This means that most RSS 1.0 and RSS
by dugite-code 3y ago
Technically yes, although it may not be respected.
> Elements from other namespaces may be included pretty much anywhere. This means that most RSS 1.0 and RSS 2.0 modules may be used in Atom.
https://validator.w3.org/feed/docs/atom.html#extensibility https://validator.w3.org/feed/docs/atom.html#extensibility
I believe this wasn't included because you can just set the Expires header on the web server to control cache times.