@JollyRoberts You can define a new property in https://w3id.org/fep namespace (see FEP-888d), along with the Feed type.I think this is better than attributing actor to a collection, which is very unusual (though I don't expect that to cause any interop issues). Another option is to use an array value for attributedTo, this is also uncommon but some implementations do this (If I remember correctly, PeerTube is one of them).@protocol