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MEDIAMAN                                                     M.S. Sporny
Internet-Draft                                                  A.G. Guy
Intended status: Standards Track                          Digital Bazaar
Expires: 25 May 2022                                       November 2021


                   Media Types with Multiple Suffixes
                    draft-ietf-mediaman-suffixes-00

Abstract

   This document updates RFC 6838 "Media Type Specifications and
   Registration Procedures" to describe how to interpret subtypes with
   multiple suffixes.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on 5 May 2022.

Copyright Notice

   Copyright (c) 2021 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   license-info) in effect on the date of publication of this document.
   Please review these documents carefully, as they describe your rights
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   provided without warranty as described in the Revised BSD License.






Sporny & Guy               Expires 25 May 2022                  [Page 1]
Internet-Draft     Media Types with Multiple Suffixes      November 2021


Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Conventions Used in This Document . . . . . . . . . . . .   2
   2.  Media Types with Multiple Suffixes  . . . . . . . . . . . . .   2
     2.1.  Processing Multiple Suffixes  . . . . . . . . . . . . . .   3
   3.  Normative References  . . . . . . . . . . . . . . . . . . . .   3
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . .   4
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Introduction

   As written, RFC 6838 [RFC6838] permits the registration of media type
   subtype names which contain any number of occurrences of the "+"
   character.  RFC 6838 defines the characters following the final "+"
   to be a structured syntax suffix, but does not define anything
   further about how to interpret subtype names containing more than one
   "+" character.

   This document updates RFC 6838 to clarify how to interpret subtype
   names containing more than one "+" character as subtypes with
   multiple suffixes.

   As registration of media types which use a structured suffix has
   become widely supported, this enables further specialization of media
   types that build on already registered and well-defined media types
   which themselves use a structured suffix.

1.1.  Conventions Used in This Document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119] when they
   appear in ALL CAPS.  They may also appear in lower or mixed case as
   plain English words, without any normative meaning.

2.  Media Types with Multiple Suffixes

   The following paragraphs are additions to RFC 6838.

   Media types MAY be registered with more than one suffix appended to
   the base subtype name.  The suffixes MUST be interpreted as ordered.
   Valid media type names containing a structured suffix are built from
   right to left (not left to right).  Characters on the left-most side
   of the left-most "+" in a subtype name specify the base subtype name.
   Characters to the right of each "+" in a subtype name denote
   additional structured syntax specifier suffixes.




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