2.3.7 Threaded Comments

Threaded comments represent a collaborative annotation system that replaces and/or works in addition to legacy comments ([ISO/IEC29500-1:2016] section 18.7). The comment threads attached to and associated with cells in a worksheet are stored separately from other cell content. A comment thread attached to a cell is comprised of a top-level threaded comment and its replies, if there are any, to provide annotations, assumptions, instructions, reminders, feedback, collaborative discussion among coauthors, and so forth. A threaded comment specified by complex type CT_ThreadedComment (section 2.6.205) contains information about the author, mentions in the comment, and its parent if it is not a top-level comment.