Subject: [core] [Technical Errata Reported] RFC7252 (5078)

From: RFC Errata System <[email-masked]>
Date: Mon, 7 Aug 2017 11:05:19 -0700 (PDT)

The following errata report has been submitted for RFC7252,
"The Constrained Application Protocol (CoAP)".

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You may review the report below and at:
http://www.rfc-editor.org/errata/eid5078

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Type: Technical
Reported by: Jim Schaad <[email-masked]>

Section: 7.2.1

Original Text
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The Content-Format code
attribute MAY include a space-separated sequence of Content-Format
codes, indicating that multiple content-formats are available.  The
syntax of the attribute value is summarized in the production "ct-
value" in Figure 12, where "cardinal", "SP", and "DQUOTE" are defined
as in [RFC6690].

Corrected Text
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The Content-Format code
attribute MAY include a space-separated sequence of Content-Format
codes, indicating that multiple content-formats are available.
The Content-Format code attribute MUST NOT appear more than once in a 
link.  The syntax of the attribute value is summarized in the 
production "ct-value" in Figure 12, where "cardinal", "SP", and 
"DQUOTE" are defined as in [RFC6690].

Notes
-----
Insert a sentence that says that the code MUST NOT appear more than once.  This appears to be what was intended, but not stated, by the authors since it supports the space separated values to appear in a single attribute value.

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RFC7252 (draft-ietf-core-coap-18)
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Title               : The Constrained Application Protocol (CoAP)
Publication Date    : June 2014
Author(s)           : Z. Shelby, K. Hartke, C. Bormann
Category            : PROPOSED STANDARD
Source              : Constrained RESTful Environments APP
Area                : Applications
Stream              : IETF
Verifying Party     : IESG