2015-08-13 UTC
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[tantek_] in particular, from the rel=annotation definition at http://www.w3.org/MarkUp/draft-ietf-iiir-html-01.txt#ANNOTATION it says "'margin notes' or other criticism on another's document" - that sentence strongly implies inline embedding/display intentions, in contrast to just a "reply" which could be expected to be shown at the bottom as part of a list of comments.