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Identifiers for CBOR

This document specifies a tag for identifiers in Concise Binary Object Representation (CBOR) [1].

Tag: 39
Data item: multiple
Semantics: Identifier
Point of contact: Lucas Clemente <>
Description of semantics:


Tag 39 can be applied to multiple types to indicate that the tagged object has identifier semantics. For numeric identifiers (e.g. an integer as primary key in a database) this implies that they are not necessarily meant for arithmetic computations.


As an example, treating a 64bit unsigned integer as an arithmetic floating point type in JavaScript may lead to incorrect behavior.


[1] C. Bormann, and P. Hoffman. "Concise Binary Object Representation (CBOR)". RFC 7049, October 2013.


Lucas Clemente