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Status: Reported (1)

RFC 5646, "Tags for Identifying Languages", September 2009

Source of RFC: ltru (app)

Errata ID: 5457
Status: Reported
Type: Technical

Reported By: Peter Occil
Date Reported: 2018-08-12

Section 2.2.9 says:

   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.

It should say:

   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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