Internet-Draft IANA Registrations for the Concise Data December 2025
Leiba & Birkholz Expires 15 June 2026 [Page]
Workgroup:
CBOR
Internet-Draft:
draft-leiba-cbor-cddl-media-type-latest
Published:
Intended Status:
Standards Track
Expires:
Authors:
B. Leiba
Futurewei Technologies
H. Birkholz
Fraunhofer SIT

IANA Registrations for the Concise Data Definition Language (CDDL)

Abstract

When the Concise Data Definition Language (CDDL) was defined, media-type, content-format, CBOR tag, and a file name extension were not defined for CDDL Definitions in RFC 8610. Correspondingly, this documents specifies a media type (including a file name extension), a content format, and a CBOR tag for CDDL Definitions as specified in RFC 8610.

Discussion Venues

This note is to be removed before publishing as an RFC.

Source for this draft and an issue tracker can be found at https://github.com/henkbirkholz/draft-leiba-cbor-cddl-media-type.

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 Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet-Drafts is at https://datatracker.ietf.org/drafts/current/.

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This Internet-Draft will expire on 15 June 2026.

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Table of Contents

1. Introduction

When the Concise Data Definition Language (CDDL) was defined, media-type, content-format, CBOR tag, and a file name extension were not defined for CDDL Definitions in [RFC8610]. Correspondingly, this documents specifies a media type (including a file name extension, see Table 1), a content format (see Table 2), and a CBOR tag (see Table 3) for CDDL Definitions as specified in [RFC8610].

2. IANA Considerations

2.1. Media Type

IANA is requested to add "application/cddl" as a new media type for CDDL Definitions to the "Media Types" registry [IANA.media-types] in the Standards Tree [RFC6838]:

Table 1: CDDL Definition Media Type
Name Template Reference
cddl application/cddl [RFC8610] and RFCthis
Type name:

application

Subtype name:

cddl

Required parameters:

N/A

Optional parameters:

N/A

Encoding considerations:

text

Security considerations:

See Security Considerations in RFC 8610.

Interoperability considerations:

N/A

Published specification:

RFCthis

Applications that use this media type:

Applications that need to describe the structure of data in representation formats such as CBOR and JSON.

Fragment identifier considerations:

N/A

Additional information:
Deprecated alias names for this type:

N/A

Magic number(s):

N/A

File extension(s):

cddl

Macintosh file type code(s):

N/A

Person/email address to contact for further information:

CBOR WG mailing list (cbor@ietf.org)

Intended usage:

COMMON

Restriction on usage:

none

Author:

See Author's Addresses section

Change controller:

IETF

Provisional registration:

no

2.2. CoAP Content Format

IANA is requested to assign a Content-Format ID for CDDL Definitions in the "CoAP Content-Formats" registry, within the "Constrained RESTful Environments (CoRE) Parameters" registry group [IANA.core-parameters]:

Table 2: CDDL Definition Content Format
Content-Type Content Coding ID Reference
application/cddl - TBD1 [RFC8610] and RFCthis

If possible, TBD1 should be assigned in the 256...9999 range.

2.3. CBOR Tag

IANA is requested to allocate a tag for CDDL Definitions in the "CBOR Tags" registry [IANA.cbor-tags], preferably with the specific value requested:

Table 3: CDDL Definition CBOR Tag
Tag Data Item Semantics
4344 text CDDL Definition as defined in [RFC8610]

3. References

3.1. Normative References

[IANA.cbor-tags]
IANA, "Concise Binary Object Representation (CBOR) Tags", <https://www.iana.org/assignments/cbor-tags>.
[IANA.core-parameters]
IANA, "Constrained RESTful Environments (CoRE) Parameters", <https://www.iana.org/assignments/core-parameters>.
[IANA.media-types]
IANA, "Media Types", <https://www.iana.org/assignments/media-types>.
[RFC8610]
Birkholz, H., Vigano, C., and C. Bormann, "Concise Data Definition Language (CDDL): A Notational Convention to Express Concise Binary Object Representation (CBOR) and JSON Data Structures", RFC 8610, DOI 10.17487/RFC8610, , <https://www.rfc-editor.org/rfc/rfc8610>.

3.2. Informative References

[RFC6838]
Freed, N., Klensin, J., and T. Hansen, "Media Type Specifications and Registration Procedures", BCP 13, RFC 6838, DOI 10.17487/RFC6838, , <https://www.rfc-editor.org/rfc/rfc6838>.

Authors' Addresses

Barry Leiba
Futurewei Technologies
URI: http://internetmessagingtechnology.org/
Henk Birkholz
Fraunhofer SIT
Rheinstrasse 75
64295 Darmstadt
Germany