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@erincandescent @trwnh @evan @jenniferplusplus @mikedev @scott @julian @trwnh
The name of the property could be different, but I think it is useful to have two collections:

- "Thread" is easier to implement, and in any case, software needs to keep track of reply trees, one way or another.
- "Context" is a bonus. It contains everything related to a conversation, including reactions and edits. Some applications may not need it, and for some it might be difficult to implement, so it should be optional.

My estimation is that implementation of "Context" + "Thread" will require roughly the same amount of effort as implementation of "Context" alone, so for those who want "Context" this separation should not be a problem. If software doesn't keep track of activities it can provide empty "Context", but their Add activities should nevertheless have it in target. Perhaps in the following form: