[ttepasse]

There are also some extensions for richer data models and working with changing feeds:

RFC 4685: Atom Threading Extensions

https://www.rfc-editor.org/rfc/rfc4685.html

RFC 4946: Atom License Extension

https://www.rfc-editor.org/rfc/rfc4946.html

RFC 5005: Feed Paging and Archiving

https://www.rfc-editor.org/rfc/rfc5005.html

RFC 6721: The Atom "deleted-entry" Element

https://www.rfc-editor.org/rfc/rfc6721.html

There were more stuff thought of, as far as I recall, and I bookmarked a lot of them. But on Delicious. Somewhere in some backup there must be my archive.