Re: Proposal ideas for Activity Streams 3 Standard

> such a statement is too simple to be useful. What does it mean for a
collection to have an audience? Does this collection have an "owner?" How
would one discover the collection? What are the operations that can be
performed on a collection? Can you "search" a collection and get a subset
of the collection as a new collection? And, is a Link
<https://www.w3.org/TR/activitystreams-core/#link> sufficient?
ActivityStreams doesn't define much metadata for inclusion in a link.

there are all mostly possible to represent: `audience`/`to`/`cc` control
visibility and delivery, `attributedTo` controls ownership, discovery
happens via any existing method (direct delivery, advertising in `streams`,
etc etc). Collections support Add and Remove. search is something that
could be further specified, i suppose. if Link isn't sufficient, then
perhaps Page? or there's the option to define an extension Bookmark that
inherits from Link, or reuse Annotation if that works. the hard part is,
again, in making all these decisions. the primitives and building blocks
are mostly there, but the conventions are not.