Concise Data Definition Language (CDDL): A Notational Convention to Express Concise Binary Object Representation (CBOR) and JSON Data Structures
RFC 8610
| Document | Type |
RFC - Proposed Standard
(June 2019; Errata)
Was draft-ietf-cbor-cddl (cbor WG)
|
|
|---|---|---|---|
| Last updated | 2020-09-04 | ||
| Replaces | draft-greevenbosch-appsawg-cbor-cddl | ||
| Stream | IETF | ||
| Formats | plain text html pdf htmlized bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Barry Leiba | ||
| Shepherd write-up | Show (last changed 2018-08-24) | ||
| IESG | IESG state | RFC 8610 (Proposed Standard) | |
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Alexey Melnikov | ||
| Send notices to | Barry Leiba <barryleiba@computer.org> | ||
| IANA | IANA review state | Version Changed - Review Needed | |
| IANA action state | RFC-Ed-Ack | ||
Internet Engineering Task Force (IETF) H. Birkholz
Request for Comments: 8610 Fraunhofer SIT
Category: Standards Track C. Vigano
ISSN: 2070-1721 Universitaet Bremen
C. Bormann
Universitaet Bremen TZI
June 2019
Concise Data Definition Language (CDDL): A Notational Convention
to Express Concise Binary Object Representation (CBOR)
and JSON Data Structures
Abstract
This document proposes a notational convention to express Concise
Binary Object Representation (CBOR) data structures (RFC 7049). Its
main goal is to provide an easy and unambiguous way to express
structures for protocol messages and data formats that use CBOR or
JSON.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
https://www.rfc-editor.org/info/rfc8610.
Birkholz, et al. Standards Track [Page 1]
RFC 8610 CDDL June 2019
Copyright Notice
Copyright (c) 2019 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
Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction ....................................................4
1.1. Requirements Notation ......................................5
1.2. Terminology ................................................5
2. The Style of Data Structure Specification .......................5
2.1. Groups and Composition in CDDL .............................7
2.1.1. Usage ..............................................10
2.1.2. Syntax .............................................10
2.2. Types .....................................................11
2.2.1. Values .............................................11
2.2.2. Choices ............................................11
2.2.3. Representation Types ...............................13
2.2.4. Root Type ..........................................14
3. Syntax .........................................................15
3.1. General Conventions .......................................15
3.2. Occurrence ................................................16
3.3. Predefined Names for Types ................................17
3.4. Arrays ....................................................18
3.5. Maps ......................................................19
3.5.1. Structs ............................................19
3.5.2. Tables .............................................22
3.5.3. Non-deterministic Order ............................23
3.5.4. Cuts in Maps .......................................24
3.6. Tags ......................................................25
3.7. Unwrapping ................................................26
3.8. Controls ..................................................27
3.8.1. Control Operator .size .............................27
3.8.2. Control Operator .bits .............................28
3.8.3. Control Operator .regexp ...........................29
Birkholz, et al. Standards Track [Page 2]
RFC 8610 CDDL June 2019
3.8.4. Control Operators .cbor and .cborseq ...............30
3.8.5. Control Operators .within and .and .................30
3.8.6. Control Operators .lt, .le, .gt, .ge, .eq,
.ne, and .default ..................................31
3.9. Socket/Plug ...............................................32
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