acter_core/models/capabilities.rs
#[derive(Debug, Eq, PartialEq)]
pub enum Capability {
// someone can add reaction on this
Reactable,
// someone can add comment on this
Commentable,
// someone can add attachment on this
Attachmentable,
// users reads/views are being tracked
ReadTracking,
// someone can rsvp on this
RSVPable,
// someone can invite on this
Inviteable,
// another custom capability
Custom(&'static str),
}