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RFC 2387, "The MIME Multipart/Related Content-type", August 1998

Source of RFC: mhtml (app)

Errata ID: 5578
Status: Rejected
Type: Technical

Reported By: Sloane Bernstein
Date Reported: 2018-12-18
Rejected by: Barry Leiba
Date Rejected: 2019-04-30

Section 3.4 says:

     related-param   := [ ";" "start" "=" cid ]
                        [ ";" "start-info"  "="
                           ( cid-list / value ) ]
                        [ ";" "type"  "=" type "/" subtype ]
                        ; order independent

It should say:

     related-param   := [ ";" "start" "=" cid ]
                        [ ";" "start-info"  "="
                           ( cid-list / value ) ]
                        ( ";" "type"  "=" type "/" subtype )
                        ; order independent

Notes:

The "type" parameter is specified by the rest of the document to be mandatory, but the ABNF in section 3.4 indicates that it is optional. Even though the ABNF is specified somewhat informally (and arguably should be formalized if this RFC is ever re-issued), it should not be giving information that contradicts the formal part of the specification (e.g., section 2).
--VERIFIER NOTES--

The "type" parameter is not specified as optional: it is in parentheses (which simply groups it), not in square-brackets (which would make it optional).

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