Additional Control Operators for CDDL

Document Type Replaced Internet-Draft (candidate for cbor WG)
Author Carsten Bormann 
Last updated 2020-09-02
Replaced by RFC 9165
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
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Stream WG state Call For Adoption By WG Issued
Document shepherd No shepherd assigned
IESG IESG state Replaced by draft-ietf-cbor-cddl-control
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The Concise Data Definition Language (CDDL), standardized in RFC 8610, provides "control operators" as its main language extension point. The present document defines a number of control operators that did not make it into RFC 8610: ".cat"/".plus" for the construction of constants, ".abnf"/".abnfb" for including ABNF (RFC 5234/RFC 7405) in CDDL specifications, and ".feature" for indicating the use of a non- basic feature in an instance.


Carsten Bormann (

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