Is there any guidance/document about how to write App-provided slots

[Enwei Zhang]

Hello,
For now, all slots are provided by ubuntu-core. I saw the concept of
App-provided slots from
https://github.com/snapcore/snapd/blob/master/interfaces/builtin/basedeclaration.go#L72
But I didn't find any guidance/document about how to do that.
Could you please help advise?
Thanks so much.

Br
Enwei
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