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From: koiti@otsl.oki.co.jp (YAMAZAKI Koiti)
Subject: Re: ISO-2022-JP (ws Re: L10N and L18N. ...)
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References: <HISAKA-H.96Jan18214152@alpha401.is.aist-nara.ac.jp> <4eksqv$p8p@news.st.rim.or.jp> <4emq0j$l79@lakshmi.tdc.unisys.co.jp>
Date: Sat, 3 Feb 1996 05:39:32 GMT
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$B;3:j!w2-%F%/%N%7%9%F%`%:%i%\%i%H%j(B $B$G$9!#(B

In article <4emq0j$l79@lakshmi.tdc.unisys.co.jp>, tomo@tdc.unisys.co.jp (Tomo Muramatsu) says:

>: sjis$B$OCN$j$^$;$s$,!"(BEUC$B$H$$$&$N$O(BISO 2022$B$K=`5r$7$F$7$F$^$9$h$M(B?
>
>$B;X<($d8F$S=P$7$N%(%9%1!<%W%7!<%1%s%9$r>o$K>JN,$7$F$$$k(B(SS2,SS3$B$O(B
>$B=|$$$F(B)$B$H$$$&7A$G!"(BISO 2022$B$K$O=`5r$7$F$^$9$1$I!"(B
>ISO-2022-JP$B$K$O=`5r$7$F$$$J$$$H;W$$$^$9!#(B(ISO-2022-JP$B$G$O!"(BG0$B$X(B
>$B$N;X<($,I,MW$J$N$G(B)
>
>: $B7h$aBG$A$r=`5r$H$$$&$N$O$*$3$,$^$7$$$N$+$J!#(B
>
>$B$3$NE@$K4X$7$F$O!"(BISO 2022$B=`5r$G$$$$$H;W$$$^$9!#(B
                   ~~~~~~~~~~~~

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$B$"$j$^$;$s!#(B

$B$"$k<BAu$G;HMQ$5$l$F$$$kId9f2=J8;z=89g(B($BB/$K8@$&J8;z%3!<%I(B)$B$O!$$"$k5,3J$KBP$7$F(B
$B!VE,9g!W$9$k$+!VITE,9g!W$+$N$I$A$i$+$7$+$"$j$^$;$s!#$?$@$7!$(BISO/IEC 6429(=JIS
X0211)$B$J$I$G$O!$5,3J$,5,Dj$9$k;EMM$N0lItJ,$r<BAu$7$?7O$,!VItJ,E,9g!W$r<gD%$9$k(B
$B$3$H$,G'$a$i$l$F$$$^$9$,!#(B

$B!V=`5r!W$H$$$&8@MU$O!$!H=`!I$NJ8;z$K$h$C$F!$0lIt$OE,9g$7$J$$$H$3$m$,$"$k$,!$(B
$B$[$\E,9g$7$F$$$k$H$$$&$h$&$J%K%e%"%s%9$rA[5/$5$;$k$N$G!$;HMQ$7$J$$$GM_$7$$!#(B

$B!t8@MU$H$,$a$O!$$3$N0L$K$7$F!$!$!$(B

EUC$B$O!$(BISO/IEC 2022$B$KE,9g$7$F$$$^$9!#6qBNE*$K8@$&$H!$(BISO/IEC 2022$B$N<BAu?e=`(B2A
$B$H$7$FE,9g$7$F$$$^$9!#(B

ISO/IEC 2022:1994$B$N0lIt$r0zMQ$7$^$9!#(B--------------------------------------

10.3 Levels of implementation

The following selections of code structure fucilities are defined here
because of their wide applicability.  Their adoption is intended  to improve
the extent of compatibility achievable in information interchange.

10.3.1 8-bit codes

Level1 - Elementary 8-bit Code

A Level 1 version of the 8-bit code structure of this International Standard
shall comprise:

- a C0 code element,
- a G0 code element having GL shift status,
- the characters SPACE and DELETE,
- optionally a C1 code element in the CR area,
- a G1 code element having GR shift status.

The designation functions for C0, C1, G0, and G1 may optionally be used at
the beginning of information interchange only.  The use of the locking-shift
functions LS0 and LS1R is not required.

Note - ISO/IEC 4873 (Level 1) is in accordance with Level 1.

Level 2 - Multiple Pre-Designated Character Sets, without Locking Shifts

A Level 2 version of the 8-bit code structure of this International
Standard shall comprise:

- the facilities of Level 1,
- either or both of the G2 and G3 code elements,
- one or both of shift functions SS2 and SS3, with GL identified as the
  single-shift area.

The designation functions for G2 and G3 may optionally be used at the
beginning of information interchange only.

Note - ISO/IEC 4873 (Level 2) is in accordance with Level 2.

Level 3 - Multiple Pre-Designated Character Sets, with Locking Shifts

A Level 3 version of the 8-bit code structure of this International
Standard shall comprise:

- the facilities of Level 2,
- one ore more of the shift functions LS0, LS1, LS2, LS3, LS1R, LS2R, SR3R.

Note - ISO/IEC 4873 (Level 3) is in accordance with Level 3.

Level 4 - Redesignation of Graphic Character Sets Within a Code

A Level 4 version of the 8-bit code structure of this International
Standard shall comprise:

- the facilities of Level 3,
- the use of graphic set designation functions (14.3) at any point during
information interchange.

The announcement function (15.2) may optionally be used at the beginning
of information interchange only.

Note - In a Level 4 version, the coded representation of one ore more
characters may change where one of the code elements G0, G1 or G2 is
redesignated, if the requirements for unique coding applies (see 7.5).

10.3.2 Qualification of levles for 8-bit code

Levels 2A, 3A, and 4A - GR as single-shift area

In a code that is acording to Levels 2, 3, or 4, except that GR is
identified as the single-shift area, then the corresponding levels ara
indentified as Level 2A, 3A, and 4A.

Levels 1C, 2C, 3C and 4C - C1 invoked as ESC Fe

In a code that is according to Levels 1, 2, 3, or 4, except that the
functions in the C1 code element are represented by ESC Fe sequences,
insted of by bit combination in columns 08 and 09, the corresponding
implementation levels are identified as Level 1C, 2C, 3C, and 4C.

If both of the above qualifications apply, the levels are identified as
Level 2AC, 3AC, and 4AC.

---------------------------------------------------------$B0zMQ=*$o$j(B

$B$3$3$+$iFI$_<h$l$k$3$H$O!$>/$J$$J8;z%;%C%H(B($BNc$($P!$(BJIS X0201$B%i%F%s!$(B
JIS X0201$BJR2>L>!$(BJIS X0208$B4A;z$N(B3$B<oN`(B)$B$7$+;HMQ$7$J$$$N$G$"$l$P!$%"%J%&%s(B
$B%5%7!<%1%s%9$d!$;X<($N%(%9%1!<%W%7!<%1%s%9$r$G$-$k$@$1;HMQ$7$J$$$G!$(B
G0, G1, G2, G3$B$K7h$aBG$A$GJ8;z%;%C%H$,;X<($5$l$F$$$k>uBV$G>pJs8r49$r9T$$(B
               ~~~~~~~~~~
$B$J$5$$(B($B$"$k$$$O<BAu$7$J$5$$(B)$B$H$$$&$3$H$G$9!#(B

ISO/IEC 2022$B$G$O!$J#?t$NJ8;z%;%C%H$rF1;~$K;HMQ$9$k>l9g!$$=$l$>$l$NJ8;z(B
$B%;%C%H$KF1$8J8;z$,$"$k>l9g(B($BNc$($P!$(BJIS X0201$B$N(B"A" $B$H(B JIS X0208$B$N(B"$B#A(B")$B$O!$(B
Gn$B$N(Bn$B$N>.$5$$J}(B(EUC$B$J$i(BJIS X0201$B$N(B"A")$B$@$1$r;HMQ$7!$(BGn$B$N(Bn$B$,Bg$-$$J}$O(B
$B;HMQ$7$F$O$$$1$J$$$H$$$&5,B'$,$"$j$^$9!#$3$N4QE@$G$OF|K\8l(BEUC$B$O(BISO/IEC
2022$B$KITE,9g$H$$$&$3$H$K$J$j$^$9!#8=:_2~@5:n6H$,9T$o$l$F$$$k(BJIS X0208
($B8x3+%l%S%e!<Cf(B)$B$G$O!$(BJIS X0201$B$HF1;~$K;HMQ$9$k>l9g$r9MN8$7$F!$(BJIS X0208
$B$N%i%F%sJ8;z!&?t;z!&5-9fN`$K4X$7$FBeBXL>>N$r5vMF$7$F$$$^$9!#(B

$B#A(B:($B@5<0L>>N(B)LANTIN CAPITAL LETTER A
($BBeBXL>>N(B)FULLWIDTH LATIN CAPITAL LETTER A

        ======================_=======================================
        $B;3:j(B $B9/0l(B  (YAMAZAKI Koiti)  koiti@otsl.oki.co.jp
        $B3t<02q<R(B $B2-%F%/%N%7%9%F%`%:%i%\%i%H%j(B $B%7%9%F%`It%7%9%F%`Bh#22](B
        Koiti's 'o' should be LATIN SMALL LETTER O WITH CIRCUMFLEX.
        ==============================================================
