rel-in-reply-to
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rel=in-reply-to is proposed method for linking from a comment to the original post that the comment is a reply to.
Previous Formats
YouTube uses a URL-qualified version of in-reply-to:
in their Atom API, e.g.:
<link rel="http://gdata.youtube.com/schemas/2007#in-reply-to"
type="application/atom+xml"
href="https://gdata.youtube.com/feeds/api/videos/2cd.../comments/978..."/>
Alternatives
Alternatively, or in addition, there is the suggestion to use:
class=u-in-reply-to
on hyperlinks from comment posts marked up with h-entry to original posts.