A feature freezer for the Concise Data Definition Language (CDDL)
draft-bormann-cbor-cddl-freezer-04
Network Working Group C. Bormann
Internet-Draft Universität Bremen TZI
Intended status: Informational 15 June 2020
Expires: 17 December 2020
A feature freezer for the Concise Data Definition Language (CDDL)
draft-bormann-cbor-cddl-freezer-04
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
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/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on 17 December 2020.
Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
Bormann Expires 17 December 2020 [Page 1]
Internet-Draft CDDL feature freezer June 2020
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 . . . . . . . . . . . . . . . . . . . . . . . . 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.
Bormann Expires 17 December 2020 [Page 2]
Internet-Draft CDDL feature freezer June 2020
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
Show full document text