contents: open threads, pending threads, closed threads.
i.e. threads where a comment has not yet been formally addressed by the WG
i.e. threads where an representative of the WG has sent an [OK?] messge, i.e. message that formally addresses a comment and asks whether the commentor is satisfied. Threads where the commentor has replied without indicating satisfaction have not, yet, been separated out.
i.e. threads where the commentor and the WG have come to consensus; any resulting changes are noted in the changelog of the respective document.