@evan @msokolov @gregprice Thanks.
So it looks to me like:
- ActivityPub delivers a Note.
- That Note can contain various ActivityStream properties, including "replies" (https://activitystrea.ms/registry/specs/activity-streams-replies/)
- The replies object then references a follow-up URL (in mastodon, e.g. https://tech.intersects.art/users/xor/statuses/109396652219164049/replies?only_other_accounts=true&page=true) which then returns (in Mastodon) a CollectionPage to list replies (which Mastodon does with URLs, rather than objects, but the spec allows either.)