[Ltru] [Technical Errata Reported] RFC5646 (5457)

RFC Errata System <rfc-editor@rfc-editor.org> Sun, 12 August 2018 19:28 UTC

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Subject: [Ltru] [Technical Errata Reported] RFC5646 (5457)
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The following errata report has been submitted for RFC5646,
"Tags for Identifying Languages".

--------------------------------------
You may review the report below and at:
http://www.rfc-editor.org/errata/eid5457

--------------------------------------
Type: Technical
Reported by: Peter Occil <poccil14@gmail.com>

Section: 2.2.9

Original Text
-------------
   A tag is considered "valid" if it satisfies these conditions:

   o  The tag is well-formed.

   o  Either the tag is in the list of grandfathered tags or all of its
      primary language, extended language, script, region, and variant
      subtags appear in the IANA Language Subtag Registry as of the
      particular registry date.

   o  There are no duplicate variant subtags.

   o  There are no duplicate singleton (extension) subtags.


Corrected Text
--------------
   A tag is considered "valid" if it satisfies these conditions:

   o  The tag is well-formed.

   o  Either the tag is in the list of grandfathered tags or all of its
      primary language, extended language, script, region, and variant
      subtags appear in the IANA Language Subtag Registry as of the
      particular registry date.

   o  There are no duplicate variant subtags.

   o  There are no duplicate singleton (extension) subtags.

   o  There is no more than one extended language subtag.

Notes
-----
Sec. 2.2.2 contains an additional validity requirement (point 4): the existence of no more than one extended language subtag.  This is not reflected in the definition of validity given in sec. 2.2.9 of the RFC.

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--------------------------------------
RFC5646 (draft-ietf-ltru-4646bis-23)
--------------------------------------
Title               : Tags for Identifying Languages
Publication Date    : September 2009
Author(s)           : A. Phillips, Ed., M. Davis, Ed.
Category            : BEST CURRENT PRACTICE
Source              : Language Tag Registry Update
Area                : Applications
Stream              : IETF
Verifying Party     : IESG