idk i feel like it's closer to a link/reference. think if u had the ability to quote post multiple posts in one post for instance. the subject is not necessarily the quote post either, sometimes you're just using the quoted post as an example or jumping off point for a different subject
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on fedi the closest synthesis answer i got was “it’s a reference that at best represents a form of citation in full”
it’s an @ mention in AS2 but it would have been way better to define it some other way, like sending a Webmention or even just leaving it out entirely and just always tagging the direct resource (Person, Note, etc)
i am trying to avoid that so is clear what the actual relation is. i hate how attachment/tag are misused and semantically overloaded to be a bit of a generic grab bag