Xref for "as opposed to"

[Marcus Richert <superbrightfuture@*********>]

Hi,

Might it be useful to distinguish a little more between different xrefs? Most often [see] seems to be used as "see more common synonym," while other times it's used not quite like an [ant]onym but "as opposed to this other term." I see in the help document that there are other xref types besides "ant" and "see" but apparently they're not in use? 

Best,

Marcus