Additional Units for SenML
draft-ietf-core-senml-more-units-06

Document Type Active Internet-Draft (core WG)
Last updated 2020-03-26 (latest revision 2020-03-19)
Replaces draft-bormann-senml-more-units
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IANA expert review comments I reviewed the units in Table 1 and they are OK for registration in the SenML units registry. However, "seconds", "degrees", and "kilograms" in the descriptions should not be in plural but in singular ("second", "degree", "kilogram"). The author acknowledged this was a typo and this will be fixed in the next revision of the draft.
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Network Working Group                                         C. Bormann
Internet-Draft                                   Universitaet Bremen TZI
Intended status: Standards Track                           19 March 2020
Expires: 20 September 2020

                       Additional Units for SenML
                  draft-ietf-core-senml-more-units-06

Abstract

   The Sensor Measurement Lists (SenML) media type supports the
   indication of units for a quantity represented.  This short document
   registers a number of additional unit names in the IANA registry for
   Units in SenML.  It also defines a registry for secondary units that
   cannot be in SenML's main registry as they are derived by linear
   transformation from units already in that registry.

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
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   This Internet-Draft will expire on 20 September 2020.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  New Primary Units . . . . . . . . . . . . . . . . . . . . . .   2
     2.1.  Rationale . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  New Registry for Secondary Units  . . . . . . . . . . . . . .   4
   4.  Operational Considerations  . . . . . . . . . . . . . . . . .   7
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .   9
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   The Sensor Measurement Lists (SenML, [RFC8428]) media type supports
   the indication of a unit, using the SenML field "u", for the quantity
   given as a data value in a SenML record.  For this purpose, SenML
   defines an IANA registry of defined Unit names and their meanings; in
   the present document, we call the Unit names registered there
   "primary Unit names".

   This short document registers a number of additional units in the
   IANA registry for Units in SenML that appear to be necessary for
   further adopting SenML in other Standards Development Organizations
   (SDOs).

   The document also defines a registry for secondary Unit names that
   cannot be in SenML's main registry as they are derived by linear
   transformation from units already in that registry.  Although SenML
   version 10 [RFC8428] does not provide for the direct use of these
   secondary units, they are planned to be supported via the use of
   SenML extension mechanisms, one of which is proposed in
   [I-D.bormann-core-senml-versions].

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in
   BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

2.  New Primary Units

   IANA is requested to assign new units in the "SenML Units"
   subregistry of the SenML registry [IANA.senml] (as defined in
   [RFC8428]):

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   +--------+--------------------------------------+-------+-----------+
   | Symbol | Description                          | Type  | Reference |
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