@evan Ah, OK - apologies for my misunderstanding. (I read 'The Activity Vocabulary provides the normative definition of five specific types of Actors: `Application `| `Group` | `Organization` | `Person` | `Service`.' and thought an `Application` was always an actor. I'm trying to understand it all, honest!)
I'm using the Rust `activitystreams` library: https://crates.io/crates/activitystreams/0.7.0-alpha.25