A feature freezer for the Concise Data Definition Language (CDDL)
draft-bormann-cbor-cddl-freezer-05
Network Working Group C. Bormann
Internet-Draft Universität Bremen TZI
Intended status: Informational 22 February 2021
Expires: 26 August 2021
A feature freezer for the Concise Data Definition Language (CDDL)
draft-bormann-cbor-cddl-freezer-05
Abstract
In defining the Concise Data Definition Language (CDDL), some
features have turned up that would be nice to have. In the interest
of completing this specification in a timely manner, the present
document was started to collect nice-to-have features that did not
make it into the first RFC for CDDL, RFC 8610.
It is now time to discuss thawing some of the concepts discussed
here. A number of additional proposals have been added.
Status of This Memo
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This Internet-Draft will expire on 26 August 2021.
Copyright Notice
Copyright (c) 2021 IETF Trust and the persons identified as the
document authors. All rights reserved.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Base language features . . . . . . . . . . . . . . . . . . . 3
2.1. Cuts . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Literal syntax . . . . . . . . . . . . . . . . . . . . . . . 3
3.1. Tag-oriented Literals . . . . . . . . . . . . . . . . . . 3
3.2. Regular Expression Literals . . . . . . . . . . . . . . . 3
4. Controls . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4.1. Control operator .pcre . . . . . . . . . . . . . . . . . 4
4.2. Endianness in .bits . . . . . . . . . . . . . . . . . . . 4
4.3. .bitfield control . . . . . . . . . . . . . . . . . . . . 4
5. Co-occurrence Constraints . . . . . . . . . . . . . . . . . . 5
6. Module superstructure . . . . . . . . . . . . . . . . . . . . 5
6.1. Namespacing . . . . . . . . . . . . . . . . . . . . . . . 6
7. Alternative Representations . . . . . . . . . . . . . . . . . 6
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
9. Security considerations . . . . . . . . . . . . . . . . . . . 6
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 6
10.1. Normative References . . . . . . . . . . . . . . . . . . 6
10.2. Informative References . . . . . . . . . . . . . . . . . 7
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 8
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 8
1. Introduction
In defining the Concise Data Definition Language (CDDL), some
features have turned up that would be nice to have. In the interest
of completing this specification in a timely manner, the present
document was started to collect nice-to-have features that did not
make it into the first RFC for CDDL [RFC8610].
It is now time to discuss thawing some of the concepts discussed
here. A number of additional proposals have been added.
There is always a danger for a document like this to become a
shopping list; the intention is to develop this document further
based on real-world experience with the first CDDL standard.
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2. Base language features
2.1. Cuts
Section 3.5.4 of [RFC8610] alludes to a new language feature, _cuts_,
and defines it in a fashion that is rather focused on a single
application in the context of maps and generating better diagnostic
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