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RFC 3454, "Preparation of Internationalized Strings ("stringprep")", December 2002

Note: This RFC has been obsoleted by RFC 7564

Source of RFC: IETF - NON WORKING GROUP
Area Assignment: int

Errata ID: 4577
Status: Held for Document Update
Type: Technical
Publication Format(s) : TEXT
Reported By: Loïc Jonas Etienne
Date Reported: 2016-01-04
Held for Document Update by: Brian Haberman
Date Held: 2016-04-05

Section 3.1 says: 

   Some characters are only useful in line-based text, and are otherwise
   invisible and ignored.

   00AD; SOFT HYPHEN
   1806; MONGOLIAN TODO SOFT HYPHEN
   200B; ZERO WIDTH SPACE
   2060; WORD JOINER
   FEFF; ZERO WIDTH NO-BREAK SPACE

It should say:

   Some characters are only useful in line-based text, and are otherwise
   invisible and ignored.

   00AD; SOFT HYPHEN
   200B; ZERO WIDTH SPACE
   2060; WORD JOINER
   FEFF; ZERO WIDTH NO-BREAK SPACE

Notes:

This issue has been reported to the unicode consortium (http://www.unicode.org/L2/L2015/15277-pubrev.html), according to which: U+1806 is not a control character; RFC 3454 is mistaken in mapping it to nothing, since the character always has a distinct visual appearance; For more information about the character, see page 528 of Core Specification, Version 8.0.

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