The IESG has received a request from the Concise Binary Object Representation Maintenance and Extensions WG (cbor) to consider the following document: - 'Concise data definition language (CDDL): a notational convention to express CBOR and JSON data structures' <draft-ietf-cbor-cddl-05.txt> as Proposed Standard The IESG plans to make a decision in the next few weeks, and solicits final comments on this action. Please send substantive comments to the ietf@ietf.org mailing lists by 2018-10-04. Exceptionally, comments may be sent to iesg@ietf.org instead. In either case, please retain the beginning of the Subject line to allow automated sorting. 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 or JSON. The file can be obtained via https://datatracker.ietf.org/doc/draft-ietf-cbor-cddl/ IESG discussion can be tracked via https://datatracker.ietf.org/doc/draft-ietf-cbor-cddl/ballot/ No IPR declarations have been submitted directly on this I-D.