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RFC 5198, "Unicode Format for Network Interchange", March 2008

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

Errata ID: 1401
Status: Held for Document Update
Type: Editorial
Publication Format(s) : TEXT
Reported By: Alfred Hoenes
Date Reported: 2008-03-31
Held for Document Update by: Pete Resnick
Date Held: 2014-05-16

Section 2, pg.3 says: 

   3.  The control characters in the ASCII range (U+0000 to U+001F and
|      U+007F to U+009F) SHOULD generally be avoided.  Space (SP,
|      U+0020), CR, LF, and Form Feed (FF, U+000C) are exceptions to
|      this principle, but use of all but the first requires care as
       discussed elsewhere in this document.  The so-called "C1
       Controls" (U+0080 through U+009F), which did not appear in ASCII,
       MUST NOT appear.

It should say:

   3.  The control characters in the ASCII range (U+0000 to U+001F and
|      U+007F to U+009F) SHOULD generally be avoided. CR, LF, and Form
|      Feed (FF, U+000C) are exceptions to this principle, but use of
|      these, as well as Space (SP, U+0020, which is often treated as a
|      control character), requires care as discussed elsewhere in this
       document.  The so-called "C1 Controls" (U+0080 through U+009F),
       which did not appear in ASCII, MUST NOT appear.

Notes:

Logical inconsistency:
SPACE is not contained in the enumeration in the first sentence;
thus, it is no *exception* to that rule, and the published text
does not make proper sense.

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