Re: Apparent discrepanccy between FAQ and Age.txt

From: Steffen Nurpmeso <sdaoden_at_yandex.com>
Date: Tue, 10 Jun 2014 19:05:38 +0200

Hello,

Karl Williamson <public_at_khwilliamson.com> wrote:
 |The FAQ http://www.unicode.org/faq/private_use.html#sentinels
 |says that the last 2 code points on the planes except BMP were made
 |noncharacters in TUS 3.1. DerivedAge.txt gives 2.0 for these.

The (nothing but informational except for @missing lines) comments
in DerivedAge.txt state very clearly:

 # - The supplementary private use code points and the non-character code points
 # were assigned in version 2.0, but not specifically listed in the UCD
 # until versions 3.0 and 3.1 respectively.

 |"The conformance wording about U+FFFE and U+FFFF changed somewhat in
 |Unicode 2.0, but these were still the only two code points with this
 |unique status"
 |
 |Unicode 3.1 [2001] was the watershed for the development of
 |noncharacters in the standard. Unicode 3.1 was the first version to add
 |supplementary characters to the standard. As a result, it also had to
 |come to grips with the fact the ISO/IEC 10646-2:2001 had reserved the
 |last two code points for every plane as "not a character"

Less scattering of information would be a pretty cool thing
nonetheless. I.e., i think it would be less academical but much
nicer if no FAQ would be necessary at all because the standard as
such covers background information, too.
I remember that one of the reasons i stopped any effort to go with
(the about 120 German Mark book of) Unicode 3.0 was that i was
incapable to wrap my head around a combining arabic example
somewhere; you need access to technical reports to get it done.

--steffen

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Received on Tue Jun 10 2014 - 12:07:31 CDT

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