What are the XML calendars?

[RokeJulianLockha]

https://stackoverflow.com/questions/30048720/whats-the-difference-between-webcal-and-webdav-caldav/30053513?noredirect=1#comment135972049_30053513

states of

https://github.com/nextcloud/calendar/issues/5464#issue-1886032426

https://user-images.githubusercontent.com/42837531/266349938-d8c932e1-e986-4606-9d87-682a175a2789.png

that

The screenshot in the NextCloud issue shows content negotiation. The first one will return a CalDAV collection (personal/), the second one is returning it as a regular subscribed calendar. I don't know what the last .xml is, I don't think there is a standardized XML for iCalendar, so probably some custom mapping.

Regarding the last part, why does the XML calendar exist? Is it standardized in any fashion? What software is able to consume it?

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Apologies if this isn't the correct place to ask. I couldn't ask via the mailing list because of

https://github.com/anonaddy/anonaddy/discussions/521#discussion-5648843

The original version is available at

https://gitlab.com/-/snippets/3601465

[girish]

@RokeJulianLockha I guess your question is for the SOGo mailing list - https://www.sogo.nu/support.html#/community (which you are already aware of per your github discussion). This is the discussion forum for topics related to SOGo when deployed on Cloudron. Upstream mailing list is the correct place for SOGo specific questions.

[RokeJulianLockha]

@girish Oh, apologies. Do you happen to know whether any kind of official forum exists? https://www.reddit.com/search/?q=sogo&type=sr doesn't return any useful results, and https://www.reddit.com/r/sogo is banned.

[girish]

@RokeJulianLockha I think the mailing list is the only channel. The mailing list archive is here - https://www.mail-archive.com/users%40sogo.nu/maillist.html . It seems active, if you can figure how to mail it