Also On This Page →

Publication Policies



All formats defined by W3C specifications are of general interest to the Internet Community and are therefore registered in the standards tree (formerly IETF tree), which requires approval by the IESG.

Status of This Document

This document explains the procedures available to register an Internet Media Type for a format defined by a W3C specification in the IANA registry. It is being maintained by Philippe Le Hégaret who, together with Wendy Seltzer, is serving as IETF/W3C liaison.

A new process, BCP 13, for registering Mime media types is defined in Media Type Specifications and Registration Procedures together with Multipurpose Internet Mail Extensions (MIME) Part Four: Registration Procedures, which covers IANA registration procedures for MIME external body access types and content-transfer-encodings. While the first document hasn’t been formally approved, it is our understanding that this is the process followed by the IETF and the IESG.

The TAG refers to this document in its April 2004 Finding Internet Media Type registration, consistency of use:

W3C Working Groups engaged in defining a format follow How to Register a Media Type with IANAto register an Internet Media Type (defined in [RFC2046]) for the format.

1. Registration process

This procedure is based on Media Type Specifications and Registration Procedures.

Note: Once a media type has been published by the IANA, the owner may request a change to its definition. The same procedure that would be appropriate for the original registration request is used to process a change request. See also Section 5.5, Change Procedures in BCP 13.

  1. Draft a proposal for the Media Type registration as a normative part of your specification, following the instructions in Media Type Specifications and Registration Procedures, section 4, and the template in section 10. Make sure that this part of the specification is readable on its own, without the context of the specification. For Additional Media Type Structured Syntax Suffixes, such as +xml or +json, see RFC 6839 and RFC 7303 requirements and section 4.5.7 Media types for XML of the World Wide Web Architecture as well. In the introduction to the relevant section, say that this registration is for community review and will be submitted to the IESG for review, approval, and registration with IANA.
  2. One to two months prior to Candidate Recommendation: Send an email to the mailing list asking for comments on the Media Type section of your specification:
  3. In preparation for Candidate Recommendation:
  4. In preparation for Proposed Recommendation and Recommendation:
    1. Check on progress of registration, first directly at IANA, and if your type is not yet registered there, contact iana-mime-comment.
    2. Update the introduction to the registration information in your specification to say either “registered with IANA at…” or “under review by the IESG…”, as applicable.
    3. If your registration points to a dated version, request update of the registration via iana-mime-comment.

W3C Community Groups may also request to register a provisional media type through W3C. All requests for W3C media types submitted to IANA get checked by W3C.

2. History of this Document

Philippe Le Hégaret, W3C Project Management Lead.

last revised $Date: 2019/12/26 19:34:33 $ by $Author: swick $