content-type parameter "reply-type"

Arnt Gulbrandsen <[email protected]>
Newsgroups gmane.ietf.rfc822
Message-ID <[email protected]>
I don't know any reference for this parameter. Here's one I saw yesterday:

Content-Type: text/plain; format=flowed; charset=iso-8859-1; 
reply-type=original

Is this specified anywhere (in an RFC, draft or elsewhere)?

Arnt
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