CBOR data definition language (CDDL): a notational convention to express CBOR data structures
draft-greevenbosch-appsawg-cbor-cddl-10
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2017-03-13
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draft-ietf-cbor-cddl, rfc8610
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Informational
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Network Working Group H. Birkholz
Internet-Draft Fraunhofer SIT
Intended status: Informational C. Vigano
Expires: September 14, 2017 Universitaet Bremen
C. Bormann
Universitaet Bremen TZI
March 13, 2017
CBOR data definition language (CDDL): a notational convention to express
CBOR data structures
draft-greevenbosch-appsawg-cbor-cddl-10
Abstract
This document proposes a notational convention to express 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.
Status of This Memo
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Copyright Notice
Copyright (c) 2017 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
(http://trustee.ietf.org/license-info) in effect on the date of
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Birkholz, et al. Expires September 14, 2017 [Page 1]
Internet-Draft CDDL March 2017
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Requirements notation . . . . . . . . . . . . . . . . . . 4
1.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . 4
2. The Style of Data Structure Specification . . . . . . . . . . 4
2.1. Groups and Composition in CDDL . . . . . . . . . . . . . 5
2.1.1. Usage . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1.2. Syntax . . . . . . . . . . . . . . . . . . . . . . . 8
2.2. Types . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2.1. Values . . . . . . . . . . . . . . . . . . . . . . . 8
2.2.2. Choices . . . . . . . . . . . . . . . . . . . . . . . 8
2.2.3. Representation Types . . . . . . . . . . . . . . . . 10
2.2.4. Root type . . . . . . . . . . . . . . . . . . . . . . 10
3. Syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1. General conventions . . . . . . . . . . . . . . . . . . . 11
3.2. Occurrence . . . . . . . . . . . . . . . . . . . . . . . 12
3.3. Predefined names for types . . . . . . . . . . . . . . . 13
3.4. Arrays . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.5. Maps . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.5.1. Structs . . . . . . . . . . . . . . . . . . . . . . . 15
3.5.2. Tables . . . . . . . . . . . . . . . . . . . . . . . 17
3.6. Tags . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.7. Annotations . . . . . . . . . . . . . . . . . . . . . . . 18
3.7.1. Annotation .size . . . . . . . . . . . . . . . . . . 19
3.7.2. Annotation .bits . . . . . . . . . . . . . . . . . . 19
3.7.3. Annotation .regexp . . . . . . . . . . . . . . . . . 20
3.7.4. Annotations .cbor and .cborseq . . . . . . . . . . . 21
3.7.5. Annotations .within and .and . . . . . . . . . . . . 21
3.7.6. Annotations .lt, .le, .gt, .ge, .eq, .ne, and
.default . . . . . . . . . . . . . . . . . . . . . . 22
3.8. Socket/Plug . . . . . . . . . . . . . . . . . . . . . . . 22
3.9. Operator Precedence . . . . . . . . . . . . . . . . . . . 24
4. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.1. Fruit . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.2. RFC 7071 . . . . . . . . . . . . . . . . . . . . . . . . 27
4.3. Examples from JSON Content Rules . . . . . . . . . . . . 31
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