Generalise the containment expectation in the context of Solid

[csarven]

Think out loud...

I think this spec need not be overly limited to LDP containment per se even in the context of Solid.

Express things in a way where it'd be compatible with both LDP Containment as well as ActivityStream Collections.

In other words, while this spec can be "Solid-PREP" but it'll still be compatible in an ActivityPub environment, or even Solid environment that's including an extension using profiles: application/ld+json; profile="https://www.w3.org/ns/activitystreams.

[CxRes]

Can you give an example or propose a PR for language change on this?