SIST ISO/IEC 6937:1995
(Main)Information technology -- Coded graphic character set for text communication -- Latin alphabet
Information technology -- Coded graphic character set for text communication -- Latin alphabet
Specifies the coded representation of the characters, a repertoire of the Latin alphabetic and non-alphabetic characters for the communication of text in many European languages using the Latin script, rules for the definitions and use of graphic character subrepertoires, i.e. subsets of the specified character repertoire. Annex A specifies the 7-bit code for the character sets of this standard. Replaces the first edition of ISO 6937-1 and -2:1983.
Technologies de l'information -- Jeu de caractères graphiques codés pour la transmission de texte -- Alphabet latin
Information technology - Coded graphic character set for text communication - Latin alphabet
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INTERNATIONAL
ISO/IEC
STANDARD
6937
Second edition
1994-06-l 5
Information technology - Coded graphic
character set for text communication -
Latin alphabet
Technologies de I’informa tion - Jeu de caractkres graphiques cod& pour
la transmission de texte - Alphabet latin
Reference number
ISOAEC 6937:1994(E)
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ISOAEC 6937:1994 (E)
Contents
Page
iv
Foreword
V
Introduction
1
1 Scope
1
2 Conformance and implementation
2.1 Conformance 1
2
2.2 Implementation
2
3 Normative references
4 Definitions 2
4
5 Notation, code table and names
4
5.1 Notation
4
5.2 Code table
4
5.3 Names
6 Specifications of SPACE, NO-BREAK SPACE and
SOFT HYPHEN
7 Composition of the character repertoire
8 Specification of the coded character set
8.1 Character sets
8.2 Explanations concerning the code table
8.3 Coded representations of the graphic characters of the
repertoire
9 Graphic character subrepertoires
10 Identification of options
10.1 Purpose and context of identification
10.2 Identification of coding method
10.3 Identification of primary and supplementary sets
10.4 Identification of subrepertoire
0 ISO/IEC 1994
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
lSO/IEC Copyright Office l Case Postale 56 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
ii
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0 ISOAEC
ISOIIEC 6937:1994 (E)
Annex A : 7-bit code 19
Annex B : Method of definition of short identifiers of this
International Standard 22
Annex C : Use of non-spacing diacritical marks 32
Annex D : Use of Latin alphabetic characters in various
languages 34
Annex E : Alternative coded representation of the repertoire
with no non-spacing diacritical marks 38
Annex F : Bibliography 39
Annex G : Main differences between the first edition (1983)
of IS0 6937/l and 6937/2, and the present edition of this
International Standard 40
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ISOAEC 6937:1994 (E)
0 ISO/IEC
Foreword
IS0 (the International Organization for Standardization) and IEC (the Inter-
national Electrotechnical Commission) form the specialized system for
worldwide standardization. National bodies that are members of IS0 or
IEC participate in the development of International Standards through
technical committees established by the respective organization to deal
with particular fields of technical activity. IS0 and IEC technical commit-
tees collaborate in fields of mutual interest. Other international organiza-
tions, governmental and non-governmental, in liaison with IS0 and IEC,
also take part in the work.
In the field of information technology, IS0 and IEC have established a joint
technical committee, lSO/IEC JTC 1. Draft International Standards adopted
by the joint technical committee are circulated to national bodies for vot-
ing. Publication as an International Standard requires approval by at least
75 % of the national bodies casting a vote.
International Standard lSO/IEC 6937 was prepared by Joint Technical
Committee lSO/IEC JTC 1, Information technology, Subcommittee SC 2,
Coded character sets.
This second edition cancels and replaces the first edition (IS0 6937-l and
2:1983), which have been technically revised.
Annex A forms an integral part of this International Standard. Annexes B,
C, D, E, F and G are for information only.
iv
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0 ISOAEC
ISOAEC 6937:1994 (E)
Introduction
This International Standard specifies repertoires of graphic characters
and their coded representations, for use in text communication.
Although, in general, text (see 4.19) consists of characters and pictures,
this International Standard applies only to text made up of characters.
The specifications are based on 8-bit coding; Annex A specifies the -/-bit
code for the character set of this International Standard.
Other annexes include:
a) a description of the method used to define a short identifier for each
character specified in this International Standard (Annex B);
b) a summary of the use of non-spacing diacritical marks in combination
with letters of the basic Latin alphabetic characters (Annex C);
c) a summary of the use of Latin alphabetic characters in various
languages (Annex D);
d) an alternative coded representation of the repertoire with no
non-spacing diacritical marks (Annex E);
e) a bibliography (Annex F);
f) a summary of differences between the first edition (1983) of IS0
6937/i and 6937/2, and the present edition of this International Standard
(Annex G).
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INTERNATIONAL STANDARD 0 lSO/IEC
ISOIIEC 6937:1994 (E)
Information technology - Coded graphic character set for text
communication - Latin alphabet
1 Scope
This International Standard
a) specifies the coded representation of the characters;
b) specifies a repertoire of the Latin alphabetic and non-alphabetic characters for the communication of text in
many European languages using the Latin script;
c) specifies rules for the definitions and use of graphic character subrepertoires, i.e. subsets of the specified
character repertoire.
2 Conformance and implementation
.
21 Conformance
2.1 .l Conformance of information interchange
A coded-character-data-element (CC-data-element) within coded information for interchange is in conformance
with this International Standard if all coded representations of characters within that CC-data-element conform to
the mandatory requirements of this International Standard.
A claim of conformance shall identify:
- the subrepertoire in accordance with clause 9, if one has been adopted,
- the 7-bit coding in accordance with Annex A, if it has been adopted.
2.1.2 Conformance of devices
A device is in conformance with this International Standard if it conforms to the requirements of 2.1.2.1 and either
or both 2.1.2.2 and 2.1.2.3 below.
2.1.2.1 Device description
A device that conforms to this International Standard shall be the subject of a description that identifies the means
by which the user may supply characters to the device, or may recognize them when they are made available to
the user, as specified respectively in 2.1.2.2 and 2.1.2.3 below.
1
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ISO/IEC 6937:1994 (E)
0 ISOAEC
2.1.2.2 Originating devices
An originating device shall allow its user to supply any sequence of characters of the character repertoire, and
shall be capable of transmitting their coded representations within a CC-data-element.
2.1.2.3 Receiving devices
A receiving device shall be capable of receiving and interpreting any coded representation of characters that are
within a CC-data-element, and that conform to 2.1 .l of this International Standard, and shall make the
corresponding characters available to its user in such a way that the user can identify them among those of the
repertoire, and can distinguish them from each other.
2.2 Implementation
The use of this character set requires definitions of its implementation in various media. For example, these could
include magnetic and optical interchangeable media and transmission channels, thus permitting interchange of
data to take place either indirectly by means of an intermediate recording on a physical medium, or by local
connection of various units (such as input and output devices and computers) or by means of data transmission
equipment.
The implementation of this coded character set in physical media and for transmission, taking into account the
need for error checking, may be the subject of other International Standards.
3 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this
International Standard. At the time of publication, the editions indicated were valid. All Standards are subject to
revision, and parties to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0
maintain registers of currently valid International Standards.
IS0 2022:1986, Information processing - IS0 7-bit and 8-bit coded character sets - Code extension techniques.
ISO/IEC 7350:1991, Information technology - Registration of repertoires of the graphic characters from
/SO//EC 10367.
ISO/IEC 10367:1991, Information technology - Standardized coded graphic character sets for use in 8-bit codes.
ISO/IEC 10538: 1991, Information technology - Control functions for text communication.
For the purposes of this International Standard, the following definitions apply:
4.1 active position: The character position which is to image the graphic symbol representing the next graphic
character or relative to which the next control function is to be executed.
4.2 bit combination: An ordered set of bits used for the representation of characters.
4.3 character: A member of a set of elements used for the organization, control or representation of data.
4.4 character position: The portion of a display that is imaging or is capable of imaging a graphic symbol.
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ISOIIEC 6937:1994 (E)
4.5 coded-character-data-element (CC-data-element): An element of interchanged information that is
specified to consist of a sequence of coded representations of characters, in accordance with one or more
identified standards for coded character sets.
NOTES
1 In a communication environment in accordance with the Reference Model for Open Systems Interconnection of IS0 7498,
a CC-data-element will form all or part of the information that corresponds to the Presentation-Protocol-Data-Unit (PPDU)
defined in that International Standard.
2 When information interchange is accomplished by means of interchangeable media, a CC-data-element will form all or
part of the information that corresponds to the user data, and not that recorded during formatting and initialization.
4.6 coded character set; code: A set of unambiguous rules that establishes a character set and the
one-to-one relationship between the characters of the set and their bit combinations.
4.7 code extension: The techniques for the encoding of characters that are not included in the character set of
a given code.
4.8 code table: A table showing the character allocated to each bit combination in a code.
4.9 control character: A control function the coded representation of which consists of a single bit combination.
4.10 control function: An element of a character set that affects the recording, processing, transmission or
interpretation of data, and that has a coded representation consisting of one or more bit combinations.
4.11 device: A component of information processing equipment which can transmit, and/or receive, coded
information within CC-data-elements.
NOTE 3 It may be an input/output device in the conventional sense, or a process such as an application program or gateway
function.
4.12 escape sequence: A string of bit combinations that are used for control purposes in code extension
procedures. The first of these bit combinations represents the control function ESCAPE.
NOTE 4 Formats and rules regarding the use of escape sequences are specified in IS0 2022.
4.13 graphic character: A character, other than a control function, that has a visual representation normally
handwritten, printed or displayed, and that has a coded representation consisting of one or more bit combinations.
4.14 graphic symbol: A visual representation of a graphic character or of a control function.
4.15 repertoire: A specified set of characters that are represented by one or more bit combinations of a coded
character set.
4.16 text: A representation of information for human comprehension that is intended for presentation in a
two-dimensional form, for example printed on paper or displayed on a screen.
Text consists of symbols, phrases or sentences in natural or artificial languages, pictures, diagrams and tables
NOTE 5 This international Standard applies only to text made up of characters.
4.17 text COmmUniCatiOn; communication of text: The transfer of text by means of telecommunications.
NOTE 6 In the context of this International Standard, text communication is by means of binary-coded representations of
characters.
4.18 user: A person or other entity that invokes the services provided by a device.
3
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ISOAEC 6937:1994 (E)
0 ISOAEC
NOTES
7 This entity may be a process such as an application program if the “device” is a code convertor or a gateway function, for
example.
8 The characters, as supplied by the user or made available to the user, may be in the form of codes local to the device, or
of non-conventional visible representations, provided that 2.1.2 above is satisfied.
5 Notation, code table and names
5.1 Notation
The bits of the bit combinations of the 8-bit code are identified by b8, b7, b6, b5, b4, b3, b2 and bl, where b8 is
the highest-order, or most significant bit and bl is the lowest-order, or least significant bit.
The bit combinations may be interpreted to represent numbers in the range 0 to 255 in binary notation by
attributing the following weights to the individual bits:
\
Brt . b b b b b b b b
8 7 6 5 4 3 2 1
r
Weight 128 64 32 16 8 4 2 1
i
In this International Standard, the bit combinations are identified by notations of the form xx/yy, where xx and yy
are numbers in the range 00 to 15. The correspondence between the notations of the form xx/yy and the bit
combinations consisting of the bits b8 to bl, is as follows:
- xx is the number represented by b 8’ b7, b6 and b5 where these bits are given the weights 8, 4, 2 and 1,
respectively;
- yy is the number represented by b
4, b3, b2 and bl where these bits are given the weights 8, 4, 2 and 1 y
respectively.
The notations of the form xx/yy are the same as the ones used to identify code table positions, where xx is the
column number and yy is the row number (see 5.2).
5.2 Code table
An 8-bit code table consists of 256 positions arranged in 16 columns and 16 rows. The columns and rows are
numbered 00 to 15.
The code table positions are identified by notations of the form xx/yy, where xx is the column number and yy is the
row number.
The positions of the code table are in one-to-one correspondence with the bit combinations of the code. The
notation of a code table position, of the form xx/yy, is the same as that of the corresponding bit combination.
5.3 Names
This International Standard assigns one name to each character. In addition, it specifies an acronym for the three
characters SPACE, NO-BREAK SPACE and SOFT HYPHEN and a graphic symbol for the other graphic
characters. By convention, only capital letters, space and hyphen are used for writing the names of characters. It is
intended that the acronym and this convention be retained in all translations of the text of this International Stan-
dard.
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ISO/IEC 6937:1994 (E)
The names chosen to denote graphic characters are intended to reflect their customary meaning. However, this
International Standard does not define and does not restrict the meanings of graphic characters. Neither does it
specify a particular style or font design for imaging the graphic characters.
6 Specifications of SPACE, MO-BREAK SPACE and SOFT HYPHEN
6.1 SPACE (SP): A graphic character that has a visual representation consisting of the absence of a graphic
symbol. Its coded representation is 02/00.
6.2 NO-BREAK SPACE (NBSP): A graphic character, the visual representation of which consists of the ab-
sence of a graphic symbol, for use when a line break is to be prevented in the text as presented.
6.3 SOFT HYPHEN (SHY): A graphic character that is imaged by a graphic symbol identical with, or similar to,
that representing HYPHEN-MINUS, for use when a line break has been established within a word.
7 Composition of the character repertoire
The repertoire of the graphic characters defined in this International Standard consists of
a) SPACE (SP)
and of 332 characters as follows
b) Latin alphabetic characters comprising
1) the 52 capital and small letters of the basic Latin alphabet,
2) accented letters, the graphic representations of which consist of combinations of basic Latin letters with
diacritical marks,
3) special alphabetic characters which are neither basic Latin letters nor combinations of basic Latin letters
with diacritical marks;
c) non-alphabetic characters, such as digits, fractions, punctuation and diacritical marks, monetary symbols etc.
The repertoire, excluding SPACE, is specified in table 4. In each table entry, the first column specifies the name of
the character. The second column specifies its coded representation (see 8.3).
NOTES
9 A survey of the use of Latin characters in various languages is included in Annex D.
IO Use of the following characters: LATIN CAPITAL LETTER L WITH MIDDLE DOT, LATIN SMALL LETTER L WITH
MIDDLE DOT and LATIN SMALL LETTER N PRECEDED BY APOSTROPHE, is deprecated and these characters may be
removed from the next edition of this International Standard.
8 Specification of the coded character set
8.1 Character sets
The coded representations of the graphic characters of the repertoire defined in this International Standard make
use of the character SPACE and of two character sets, that is “a primary set” and a “supplementary set ”.
The primary set shall consist of the graphic characters of the basic GO set of ISO/IEC 10367, represented by bit
combinations 02/01 to 07/14. The characters of the primary set shall not be used in combination with each other to
generate graphic characters of the repertoire defined in this International Standard.
5
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ISOAEC 6937:1994 (E)
0 ISOAEC
The primary set contains the letters of the basic Latin alphabet, some spacing diacritical marks and a number of
non-alphabetic characters.
The supplementary set contains graphic characters and non-spacing diacritical marks, represented by bit
combinations 1 O/O0 to 15/l 5. The graphic characters consist of a number of characters used in addition to those in
the primary set.
A non-spacing diacritical mark shall be used only in combination with certain basic Latin letters, or with SPACE.
The allowed combinations of non-spacing diacritical marks and letters are the ones needed to represent the
accented letters included in table 4. This set of combinations is summarized in Annex C.
The code table for the primary and the supplementary sets of graphic characters is given in table 1 l Shaded
positions denote bit combinations which are not part of the sets concerned.
8.2 Explanations concerning the code table
8.2.1 Bit combinations 1 O/O4 and 1 O/O6 are reserved for future standardization, and shall not be used.
8.2.2 The non-spacing diacritical marks of column 12 are used only in combination with certain basic Latin letters,
or with SPACE (see Annex C).
8.2.3 Bit combinations 12/00, 12/09 and 12/12 are reserved for possible allocation of additional non-spacing
characters, and shall not be used.
8.2.4 Bit combinations 13/08 to 13/l 1 and 14/05 are reserved for future standardization, and shall not be used.
8.3 Coded representations of the graphic characters of the repertoire
The coded representations of the graphic characters of the repertoire defined in this International Standard are
specified in table 4. The formats of the coded representations are as follows:
a) Accented letters
Each accented letter is represented by a sequence of bit combinations consisting of the coded representation
of the relevant non-spacing diacritical mark (an element of the supplementary set), followed by the coded
representation of the relevant basic Latin letter (an element of the primary set).
b) Diacritical marks as separate graphic characters
The diacritical marks that are elements of the primary set (GRAVE ACCENT, CIRCUMFLEX ACCENT and
TILDE) are represented as separate graphic characters by the corresponding single bit combination in the
range 02/01 to 07/14.
The other ten of the diacritical marks of column 12 are represented as separate graphic characters by a
sequence of bit combinations consisting of the coded representation of the relevant non-spacing diacritical
mark (an element of the supplementary set), followed by the coded representation of the character SPACE,
i.e. the bit combination 02/00.
c) All other graphic characters of the repertoire
Any graphic character of the repertoire, other than an accented letter or a diacritical mark as a separate
graphic character that is not an element of the primary set, is an element of either the primary set or the
supplementary set and is represented by the corresponding single bit combination in the range 02/01 to 07/l 4
or 1 O/O0 to 15/l 5.
Depending of the code extension techniques used, a bit combination, representing an element of either the
primary or the supplementary set may have to be preceded by a code extension function invoking the character
set concerned.
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0 ISOAEC
ISOIIEC 6937:1994 (E)
NOTES Explanations concerning certain letters:
11 Accented letter LATIN SMALL LETTER G WITH CEDILLA was named “small g with acute accent” in the 1983 edition of
this International Standard. For compatibility purposes, the coded representation has been kept unchanged. The name has
been aligned with that in ISO/IEC 10367. The cedilla is placed above “g” for presentation purposes.
12 The name “capital Icelandic eth” was deleted. This letter is now named LATIN CAPITAL LETTER D WITH STROKE which
will also serve as the capital form of Icelandic Eth, where this International Standard is used. It should be noted that IS0
8859-l and ISO/IEC 10367 provide for a LATIN CAPITAL LETTER ETH as well as a LATIN CAPITAL LETTER D WITH
STROKE.
9 Graphic character subrepertoires
The purpose of defining character subrepertoires is to facilitate communication with equipment capable of
presenting text using a limited set of graphic characters at one time. An example of equipment that might make
use of subrepertoires is a text communication terminal containing an output device that has a changeable printing
element (physical or other). However, in order to comply with the requirements of this International Standard, such
a text communication terminal has to be capable of receiving and presenting all graphic characters of the
repertoire in some manner, possibly using one or more alternative printing elements.
Subrepertoires are defined in accordance with the following rules:
a) A subrepertoire shall include the character SPACE, the 26 Latin unaccented small letters and the 26 Latin
unaccented capital letters.
b) A subrepertoire shall include the 10 digits.
c) A subrepertoire shall include the following characters:
Graphic symbol Name
t
APOSTROPHE
LEFT PARENTHESIS
(
RIGHT PARENTHESIS
)
COMMA
9
HYPHEN-MINUS
. FULL STOP
I SOLIDUS
.
COLON
3 QUESTION MARK
+
PLUS SIGN
=
EQUALS SIGN
d) A subrepertoire may include any other graphic characters of the repertoire defined in this I nternationa
Standard.
e) A subrepertoire shall not include any character not defined in this International Standard.
f) Two or more graphic characters of the repertoire shall not be included as a single character in the sut Irepertoire.
The procedure for registration of subrepertoires is specified in ISO/IEC 7350.
The identifier assigned to a registered subrepertoire is intended to be used as a parameter value of the control
function IDENTIFY GRAPHIC SUBREPERTOIRE (IGS) which is defined in ISO/IEC 10538.
7
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ISO/IEC 6937:1994 (E)
0 ISOAEC
10 Identification of options
10.1 Purpose and context of identification
CC-data-elements conforming to an option of this lnternationa Standard are intended to form all or part of a
composite unit of coded information that is interchanged between a sender and a recipient. The identification of
the options of this International Standard that have been adopted by the originator shall also be available to the
recipient. The route by which such identification is communicated to the recipient is outside the scope of this
International Standard.
However, some standards for interchange of coded information may permit, or require, that the coded
representation of the identification applicable to the CC-data-elements forms part of the interchanged information.
This clause specifies a coded representation for the identification of options of this International Standard. Such
coded representations form all or part of an identifying data element, which may be included in information
interchange in accordance with the relevant standard.
10.2 Identification of coding method
The coding method adopted shall be identified by means of one of the following announcer sequences:
ESC 02/00 04/10 shall identify 7-bit coding (as in Annex A);
ESC 02/00 04/l 1 shall identify 8-bit coding.
10.3 Identification of primary and supplementary sets
The escape sequences used to designate the primary and the supplementary sets are:
ESC 02/08 04/02 : to designate the primary set of the present edition of this International Standard as
the GO set (ISO-IR 6);
ESC 02/l 3 05/02 : to designate the supplementary set of the present edition of this International
Standard as the Gl set (ISO-IR 156);
ESC 02/l 4 05/02 : to designate the supplementary set of the present edition of this International
Standard as the G2 set;
: to designate the supplementary set of the present edition of this International
ESC 02/l 5 05/02
Standard as the G3 set.
NOTE 13 The escape sequences used to designate the primary and the supplementary sets of IS0 6937/2:1983 are:
.
to designate the primary set as the GO set (ISO-IR
ESC 02lO8 04100 : Y
2)
ESC 02lO9 06112 : to designate the supplementary set as the Gl set ( ISO-IR 90);
ESC 0200 06/I 2 : to designate the supplementary set as the G2 set;
to designate the supplementary set as the G3 set.
ESC 02/l 1 06/12 :
10.4 Identification of subrepertoire
The subrepertoire adopted shall be identified by the control function IDENTIFY GRAPHIC SUBREPERTOIRE
(IGS) which is defined in ISO/IEC 10538.
Parameter values identifying graphic character subrepertoires are registered in accordance with ISOAEC 7350.
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0 ISOAEC
ISOIIEC 6937:1994 (E)
Table 1 - Primary and supplementary sets of graphic characters for text communication (coding when
represented by bit combinations 02/01 to 07/14 and lO/OO to M/15 of an 8-bit code)
0 1 2 3 4 5 6
7 8 9 A B C D F
- - - - - - - - - - - - - -
-
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: " .
- @
” : ‘_ :_
,:. ‘. P ,’ '_
., ., ”
‘.
:
:
,.' ,o~.:': .:.,j6. 32. ._
48 64 80 96 112 .,,, '128 . ~,. ,144 160 176 >>'. j99: 208 224
-:::::.--- - 240
: '.
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1
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.'.". + A3
-
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: ., I
:
$j’$ I.‘:. 33
49 65 81 97
177 193 209 225 241
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1v
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: 2
8
.“, ‘, .‘,
2 . . 2 R
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-
‘_ ‘. ‘.
‘.
‘. ‘. :. ”
& 34
2”. 50 66 82 98 114 ,_, -a.: 136' 162 178 194 210 226
242
A
a
3 0
.’
3 _; 3 C S C
..*. # s a
-
.’
51 67 83 99 115 .,,A$~,' 147
~ 163 179 195 211 227 243
:
‘. u
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-
A&.: 36 52 68 84 100 116 ,_,. -& 132 _. j.j# ., 180 196 212 228
244
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-
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53 69 85 101 181 197 213 ~ .&!i.:L 245
am
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F
6 6 V f V IJ
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7
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38 54 86
70 102 118 :,, -A,, 1,: j.66. :'_. 182 198 214 230 246
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-
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215 231 247
:
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l
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8 8 x l J 1
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.. :
:
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B + K k
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.-a. 43 59 75 107 123 IiQ. 187 203 235 251
. . . . . _,.,. 171
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-.
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62 78 110 190 206 222 238 254
+,+.!4.'.,~, 46
V
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63 79 111
L- l'S.~1. 47 191 207 223 239 255
9
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ISOAEC 6937:1994 (E)
0 ISOAEC
Table 2 - Specification of the primary character set in an 8-bit code
I .
Bit
Name Bit Name
comb. comb.
05/00 LATIN CAPITAL LETTER P
02/o 1 EXCLAMATION MARK 05/o 1 LATIN CAPITAL LETTER Q
02/02 QUOTATION MARK 05/02 LATIN CAPITAL LETTER R
I 02/03 I NUMBER SIGN I 05/03 I LATIN CAPITAL LETTER S I
02/04 DOLLAR SIGN
05/04 LATIN CAPITAL LETTER T
02/05 PERCENT SIGN
05/05 LATIN CAPITAL LETTER
...
SLOVENSKI STANDARD
SIST ISO/IEC 6937:1995
01-junij-1995
Information technology - Coded graphic character set for text communication -
Latin alphabet
Information technology -- Coded graphic character set for text communication -- Latin
alphabet
Technologies de l'information -- Jeu de caractères graphiques codés pour la
transmission de texte -- Alphabet latin
Ta slovenski standard je istoveten z: ISO/IEC 6937:1994
ICS:
35.040 Nabori znakov in kodiranje Character sets and
informacij information coding
SIST ISO/IEC 6937:1995 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST ISO/IEC 6937:1995
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SIST ISO/IEC 6937:1995
INTERNATIONAL
ISO/IEC
STANDARD
6937
Second edition
1994-06-l 5
Information technology - Coded graphic
character set for text communication -
Latin alphabet
Technologies de I’informa tion - Jeu de caractkres graphiques cod& pour
la transmission de texte - Alphabet latin
Reference number
ISOAEC 6937:1994(E)
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SIST ISO/IEC 6937:1995
ISOAEC 6937:1994 (E)
Contents
Page
iv
Foreword
V
Introduction
1
1 Scope
1
2 Conformance and implementation
2.1 Conformance 1
2
2.2 Implementation
2
3 Normative references
4 Definitions 2
4
5 Notation, code table and names
4
5.1 Notation
4
5.2 Code table
4
5.3 Names
6 Specifications of SPACE, NO-BREAK SPACE and
SOFT HYPHEN
7 Composition of the character repertoire
8 Specification of the coded character set
8.1 Character sets
8.2 Explanations concerning the code table
8.3 Coded representations of the graphic characters of the
repertoire
9 Graphic character subrepertoires
10 Identification of options
10.1 Purpose and context of identification
10.2 Identification of coding method
10.3 Identification of primary and supplementary sets
10.4 Identification of subrepertoire
0 ISO/IEC 1994
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
lSO/IEC Copyright Office l Case Postale 56 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
ii
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ISOIIEC 6937:1994 (E)
Annex A : 7-bit code 19
Annex B : Method of definition of short identifiers of this
International Standard 22
Annex C : Use of non-spacing diacritical marks 32
Annex D : Use of Latin alphabetic characters in various
languages 34
Annex E : Alternative coded representation of the repertoire
with no non-spacing diacritical marks 38
Annex F : Bibliography 39
Annex G : Main differences between the first edition (1983)
of IS0 6937/l and 6937/2, and the present edition of this
International Standard 40
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SIST ISO/IEC 6937:1995
ISOAEC 6937:1994 (E)
0 ISO/IEC
Foreword
IS0 (the International Organization for Standardization) and IEC (the Inter-
national Electrotechnical Commission) form the specialized system for
worldwide standardization. National bodies that are members of IS0 or
IEC participate in the development of International Standards through
technical committees established by the respective organization to deal
with particular fields of technical activity. IS0 and IEC technical commit-
tees collaborate in fields of mutual interest. Other international organiza-
tions, governmental and non-governmental, in liaison with IS0 and IEC,
also take part in the work.
In the field of information technology, IS0 and IEC have established a joint
technical committee, lSO/IEC JTC 1. Draft International Standards adopted
by the joint technical committee are circulated to national bodies for vot-
ing. Publication as an International Standard requires approval by at least
75 % of the national bodies casting a vote.
International Standard lSO/IEC 6937 was prepared by Joint Technical
Committee lSO/IEC JTC 1, Information technology, Subcommittee SC 2,
Coded character sets.
This second edition cancels and replaces the first edition (IS0 6937-l and
2:1983), which have been technically revised.
Annex A forms an integral part of this International Standard. Annexes B,
C, D, E, F and G are for information only.
iv
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Introduction
This International Standard specifies repertoires of graphic characters
and their coded representations, for use in text communication.
Although, in general, text (see 4.19) consists of characters and pictures,
this International Standard applies only to text made up of characters.
The specifications are based on 8-bit coding; Annex A specifies the -/-bit
code for the character set of this International Standard.
Other annexes include:
a) a description of the method used to define a short identifier for each
character specified in this International Standard (Annex B);
b) a summary of the use of non-spacing diacritical marks in combination
with letters of the basic Latin alphabetic characters (Annex C);
c) a summary of the use of Latin alphabetic characters in various
languages (Annex D);
d) an alternative coded representation of the repertoire with no
non-spacing diacritical marks (Annex E);
e) a bibliography (Annex F);
f) a summary of differences between the first edition (1983) of IS0
6937/i and 6937/2, and the present edition of this International Standard
(Annex G).
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SIST ISO/IEC 6937:1995
INTERNATIONAL STANDARD 0 lSO/IEC
ISOIIEC 6937:1994 (E)
Information technology - Coded graphic character set for text
communication - Latin alphabet
1 Scope
This International Standard
a) specifies the coded representation of the characters;
b) specifies a repertoire of the Latin alphabetic and non-alphabetic characters for the communication of text in
many European languages using the Latin script;
c) specifies rules for the definitions and use of graphic character subrepertoires, i.e. subsets of the specified
character repertoire.
2 Conformance and implementation
.
21 Conformance
2.1 .l Conformance of information interchange
A coded-character-data-element (CC-data-element) within coded information for interchange is in conformance
with this International Standard if all coded representations of characters within that CC-data-element conform to
the mandatory requirements of this International Standard.
A claim of conformance shall identify:
- the subrepertoire in accordance with clause 9, if one has been adopted,
- the 7-bit coding in accordance with Annex A, if it has been adopted.
2.1.2 Conformance of devices
A device is in conformance with this International Standard if it conforms to the requirements of 2.1.2.1 and either
or both 2.1.2.2 and 2.1.2.3 below.
2.1.2.1 Device description
A device that conforms to this International Standard shall be the subject of a description that identifies the means
by which the user may supply characters to the device, or may recognize them when they are made available to
the user, as specified respectively in 2.1.2.2 and 2.1.2.3 below.
1
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2.1.2.2 Originating devices
An originating device shall allow its user to supply any sequence of characters of the character repertoire, and
shall be capable of transmitting their coded representations within a CC-data-element.
2.1.2.3 Receiving devices
A receiving device shall be capable of receiving and interpreting any coded representation of characters that are
within a CC-data-element, and that conform to 2.1 .l of this International Standard, and shall make the
corresponding characters available to its user in such a way that the user can identify them among those of the
repertoire, and can distinguish them from each other.
2.2 Implementation
The use of this character set requires definitions of its implementation in various media. For example, these could
include magnetic and optical interchangeable media and transmission channels, thus permitting interchange of
data to take place either indirectly by means of an intermediate recording on a physical medium, or by local
connection of various units (such as input and output devices and computers) or by means of data transmission
equipment.
The implementation of this coded character set in physical media and for transmission, taking into account the
need for error checking, may be the subject of other International Standards.
3 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this
International Standard. At the time of publication, the editions indicated were valid. All Standards are subject to
revision, and parties to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0
maintain registers of currently valid International Standards.
IS0 2022:1986, Information processing - IS0 7-bit and 8-bit coded character sets - Code extension techniques.
ISO/IEC 7350:1991, Information technology - Registration of repertoires of the graphic characters from
/SO//EC 10367.
ISO/IEC 10367:1991, Information technology - Standardized coded graphic character sets for use in 8-bit codes.
ISO/IEC 10538: 1991, Information technology - Control functions for text communication.
For the purposes of this International Standard, the following definitions apply:
4.1 active position: The character position which is to image the graphic symbol representing the next graphic
character or relative to which the next control function is to be executed.
4.2 bit combination: An ordered set of bits used for the representation of characters.
4.3 character: A member of a set of elements used for the organization, control or representation of data.
4.4 character position: The portion of a display that is imaging or is capable of imaging a graphic symbol.
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4.5 coded-character-data-element (CC-data-element): An element of interchanged information that is
specified to consist of a sequence of coded representations of characters, in accordance with one or more
identified standards for coded character sets.
NOTES
1 In a communication environment in accordance with the Reference Model for Open Systems Interconnection of IS0 7498,
a CC-data-element will form all or part of the information that corresponds to the Presentation-Protocol-Data-Unit (PPDU)
defined in that International Standard.
2 When information interchange is accomplished by means of interchangeable media, a CC-data-element will form all or
part of the information that corresponds to the user data, and not that recorded during formatting and initialization.
4.6 coded character set; code: A set of unambiguous rules that establishes a character set and the
one-to-one relationship between the characters of the set and their bit combinations.
4.7 code extension: The techniques for the encoding of characters that are not included in the character set of
a given code.
4.8 code table: A table showing the character allocated to each bit combination in a code.
4.9 control character: A control function the coded representation of which consists of a single bit combination.
4.10 control function: An element of a character set that affects the recording, processing, transmission or
interpretation of data, and that has a coded representation consisting of one or more bit combinations.
4.11 device: A component of information processing equipment which can transmit, and/or receive, coded
information within CC-data-elements.
NOTE 3 It may be an input/output device in the conventional sense, or a process such as an application program or gateway
function.
4.12 escape sequence: A string of bit combinations that are used for control purposes in code extension
procedures. The first of these bit combinations represents the control function ESCAPE.
NOTE 4 Formats and rules regarding the use of escape sequences are specified in IS0 2022.
4.13 graphic character: A character, other than a control function, that has a visual representation normally
handwritten, printed or displayed, and that has a coded representation consisting of one or more bit combinations.
4.14 graphic symbol: A visual representation of a graphic character or of a control function.
4.15 repertoire: A specified set of characters that are represented by one or more bit combinations of a coded
character set.
4.16 text: A representation of information for human comprehension that is intended for presentation in a
two-dimensional form, for example printed on paper or displayed on a screen.
Text consists of symbols, phrases or sentences in natural or artificial languages, pictures, diagrams and tables
NOTE 5 This international Standard applies only to text made up of characters.
4.17 text COmmUniCatiOn; communication of text: The transfer of text by means of telecommunications.
NOTE 6 In the context of this International Standard, text communication is by means of binary-coded representations of
characters.
4.18 user: A person or other entity that invokes the services provided by a device.
3
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NOTES
7 This entity may be a process such as an application program if the “device” is a code convertor or a gateway function, for
example.
8 The characters, as supplied by the user or made available to the user, may be in the form of codes local to the device, or
of non-conventional visible representations, provided that 2.1.2 above is satisfied.
5 Notation, code table and names
5.1 Notation
The bits of the bit combinations of the 8-bit code are identified by b8, b7, b6, b5, b4, b3, b2 and bl, where b8 is
the highest-order, or most significant bit and bl is the lowest-order, or least significant bit.
The bit combinations may be interpreted to represent numbers in the range 0 to 255 in binary notation by
attributing the following weights to the individual bits:
\
Brt . b b b b b b b b
8 7 6 5 4 3 2 1
r
Weight 128 64 32 16 8 4 2 1
i
In this International Standard, the bit combinations are identified by notations of the form xx/yy, where xx and yy
are numbers in the range 00 to 15. The correspondence between the notations of the form xx/yy and the bit
combinations consisting of the bits b8 to bl, is as follows:
- xx is the number represented by b 8’ b7, b6 and b5 where these bits are given the weights 8, 4, 2 and 1,
respectively;
- yy is the number represented by b
4, b3, b2 and bl where these bits are given the weights 8, 4, 2 and 1 y
respectively.
The notations of the form xx/yy are the same as the ones used to identify code table positions, where xx is the
column number and yy is the row number (see 5.2).
5.2 Code table
An 8-bit code table consists of 256 positions arranged in 16 columns and 16 rows. The columns and rows are
numbered 00 to 15.
The code table positions are identified by notations of the form xx/yy, where xx is the column number and yy is the
row number.
The positions of the code table are in one-to-one correspondence with the bit combinations of the code. The
notation of a code table position, of the form xx/yy, is the same as that of the corresponding bit combination.
5.3 Names
This International Standard assigns one name to each character. In addition, it specifies an acronym for the three
characters SPACE, NO-BREAK SPACE and SOFT HYPHEN and a graphic symbol for the other graphic
characters. By convention, only capital letters, space and hyphen are used for writing the names of characters. It is
intended that the acronym and this convention be retained in all translations of the text of this International Stan-
dard.
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The names chosen to denote graphic characters are intended to reflect their customary meaning. However, this
International Standard does not define and does not restrict the meanings of graphic characters. Neither does it
specify a particular style or font design for imaging the graphic characters.
6 Specifications of SPACE, MO-BREAK SPACE and SOFT HYPHEN
6.1 SPACE (SP): A graphic character that has a visual representation consisting of the absence of a graphic
symbol. Its coded representation is 02/00.
6.2 NO-BREAK SPACE (NBSP): A graphic character, the visual representation of which consists of the ab-
sence of a graphic symbol, for use when a line break is to be prevented in the text as presented.
6.3 SOFT HYPHEN (SHY): A graphic character that is imaged by a graphic symbol identical with, or similar to,
that representing HYPHEN-MINUS, for use when a line break has been established within a word.
7 Composition of the character repertoire
The repertoire of the graphic characters defined in this International Standard consists of
a) SPACE (SP)
and of 332 characters as follows
b) Latin alphabetic characters comprising
1) the 52 capital and small letters of the basic Latin alphabet,
2) accented letters, the graphic representations of which consist of combinations of basic Latin letters with
diacritical marks,
3) special alphabetic characters which are neither basic Latin letters nor combinations of basic Latin letters
with diacritical marks;
c) non-alphabetic characters, such as digits, fractions, punctuation and diacritical marks, monetary symbols etc.
The repertoire, excluding SPACE, is specified in table 4. In each table entry, the first column specifies the name of
the character. The second column specifies its coded representation (see 8.3).
NOTES
9 A survey of the use of Latin characters in various languages is included in Annex D.
IO Use of the following characters: LATIN CAPITAL LETTER L WITH MIDDLE DOT, LATIN SMALL LETTER L WITH
MIDDLE DOT and LATIN SMALL LETTER N PRECEDED BY APOSTROPHE, is deprecated and these characters may be
removed from the next edition of this International Standard.
8 Specification of the coded character set
8.1 Character sets
The coded representations of the graphic characters of the repertoire defined in this International Standard make
use of the character SPACE and of two character sets, that is “a primary set” and a “supplementary set ”.
The primary set shall consist of the graphic characters of the basic GO set of ISO/IEC 10367, represented by bit
combinations 02/01 to 07/14. The characters of the primary set shall not be used in combination with each other to
generate graphic characters of the repertoire defined in this International Standard.
5
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The primary set contains the letters of the basic Latin alphabet, some spacing diacritical marks and a number of
non-alphabetic characters.
The supplementary set contains graphic characters and non-spacing diacritical marks, represented by bit
combinations 1 O/O0 to 15/l 5. The graphic characters consist of a number of characters used in addition to those in
the primary set.
A non-spacing diacritical mark shall be used only in combination with certain basic Latin letters, or with SPACE.
The allowed combinations of non-spacing diacritical marks and letters are the ones needed to represent the
accented letters included in table 4. This set of combinations is summarized in Annex C.
The code table for the primary and the supplementary sets of graphic characters is given in table 1 l Shaded
positions denote bit combinations which are not part of the sets concerned.
8.2 Explanations concerning the code table
8.2.1 Bit combinations 1 O/O4 and 1 O/O6 are reserved for future standardization, and shall not be used.
8.2.2 The non-spacing diacritical marks of column 12 are used only in combination with certain basic Latin letters,
or with SPACE (see Annex C).
8.2.3 Bit combinations 12/00, 12/09 and 12/12 are reserved for possible allocation of additional non-spacing
characters, and shall not be used.
8.2.4 Bit combinations 13/08 to 13/l 1 and 14/05 are reserved for future standardization, and shall not be used.
8.3 Coded representations of the graphic characters of the repertoire
The coded representations of the graphic characters of the repertoire defined in this International Standard are
specified in table 4. The formats of the coded representations are as follows:
a) Accented letters
Each accented letter is represented by a sequence of bit combinations consisting of the coded representation
of the relevant non-spacing diacritical mark (an element of the supplementary set), followed by the coded
representation of the relevant basic Latin letter (an element of the primary set).
b) Diacritical marks as separate graphic characters
The diacritical marks that are elements of the primary set (GRAVE ACCENT, CIRCUMFLEX ACCENT and
TILDE) are represented as separate graphic characters by the corresponding single bit combination in the
range 02/01 to 07/14.
The other ten of the diacritical marks of column 12 are represented as separate graphic characters by a
sequence of bit combinations consisting of the coded representation of the relevant non-spacing diacritical
mark (an element of the supplementary set), followed by the coded representation of the character SPACE,
i.e. the bit combination 02/00.
c) All other graphic characters of the repertoire
Any graphic character of the repertoire, other than an accented letter or a diacritical mark as a separate
graphic character that is not an element of the primary set, is an element of either the primary set or the
supplementary set and is represented by the corresponding single bit combination in the range 02/01 to 07/l 4
or 1 O/O0 to 15/l 5.
Depending of the code extension techniques used, a bit combination, representing an element of either the
primary or the supplementary set may have to be preceded by a code extension function invoking the character
set concerned.
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ISOIIEC 6937:1994 (E)
NOTES Explanations concerning certain letters:
11 Accented letter LATIN SMALL LETTER G WITH CEDILLA was named “small g with acute accent” in the 1983 edition of
this International Standard. For compatibility purposes, the coded representation has been kept unchanged. The name has
been aligned with that in ISO/IEC 10367. The cedilla is placed above “g” for presentation purposes.
12 The name “capital Icelandic eth” was deleted. This letter is now named LATIN CAPITAL LETTER D WITH STROKE which
will also serve as the capital form of Icelandic Eth, where this International Standard is used. It should be noted that IS0
8859-l and ISO/IEC 10367 provide for a LATIN CAPITAL LETTER ETH as well as a LATIN CAPITAL LETTER D WITH
STROKE.
9 Graphic character subrepertoires
The purpose of defining character subrepertoires is to facilitate communication with equipment capable of
presenting text using a limited set of graphic characters at one time. An example of equipment that might make
use of subrepertoires is a text communication terminal containing an output device that has a changeable printing
element (physical or other). However, in order to comply with the requirements of this International Standard, such
a text communication terminal has to be capable of receiving and presenting all graphic characters of the
repertoire in some manner, possibly using one or more alternative printing elements.
Subrepertoires are defined in accordance with the following rules:
a) A subrepertoire shall include the character SPACE, the 26 Latin unaccented small letters and the 26 Latin
unaccented capital letters.
b) A subrepertoire shall include the 10 digits.
c) A subrepertoire shall include the following characters:
Graphic symbol Name
t
APOSTROPHE
LEFT PARENTHESIS
(
RIGHT PARENTHESIS
)
COMMA
9
HYPHEN-MINUS
. FULL STOP
I SOLIDUS
.
COLON
3 QUESTION MARK
+
PLUS SIGN
=
EQUALS SIGN
d) A subrepertoire may include any other graphic characters of the repertoire defined in this I nternationa
Standard.
e) A subrepertoire shall not include any character not defined in this International Standard.
f) Two or more graphic characters of the repertoire shall not be included as a single character in the sut Irepertoire.
The procedure for registration of subrepertoires is specified in ISO/IEC 7350.
The identifier assigned to a registered subrepertoire is intended to be used as a parameter value of the control
function IDENTIFY GRAPHIC SUBREPERTOIRE (IGS) which is defined in ISO/IEC 10538.
7
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10 Identification of options
10.1 Purpose and context of identification
CC-data-elements conforming to an option of this lnternationa Standard are intended to form all or part of a
composite unit of coded information that is interchanged between a sender and a recipient. The identification of
the options of this International Standard that have been adopted by the originator shall also be available to the
recipient. The route by which such identification is communicated to the recipient is outside the scope of this
International Standard.
However, some standards for interchange of coded information may permit, or require, that the coded
representation of the identification applicable to the CC-data-elements forms part of the interchanged information.
This clause specifies a coded representation for the identification of options of this International Standard. Such
coded representations form all or part of an identifying data element, which may be included in information
interchange in accordance with the relevant standard.
10.2 Identification of coding method
The coding method adopted shall be identified by means of one of the following announcer sequences:
ESC 02/00 04/10 shall identify 7-bit coding (as in Annex A);
ESC 02/00 04/l 1 shall identify 8-bit coding.
10.3 Identification of primary and supplementary sets
The escape sequences used to designate the primary and the supplementary sets are:
ESC 02/08 04/02 : to designate the primary set of the present edition of this International Standard as
the GO set (ISO-IR 6);
ESC 02/l 3 05/02 : to designate the supplementary set of the present edition of this International
Standard as the Gl set (ISO-IR 156);
ESC 02/l 4 05/02 : to designate the supplementary set of the present edition of this International
Standard as the G2 set;
: to designate the supplementary set of the present edition of this International
ESC 02/l 5 05/02
Standard as the G3 set.
NOTE 13 The escape sequences used to designate the primary and the supplementary sets of IS0 6937/2:1983 are:
.
to designate the primary set as the GO set (ISO-IR
ESC 02lO8 04100 : Y
2)
ESC 02lO9 06112 : to designate the supplementary set as the Gl set ( ISO-IR 90);
ESC 0200 06/I 2 : to designate the supplementary set as the G2 set;
to designate the supplementary set as the G3 set.
ESC 02/l 1 06/12 :
10.4 Identification of subrepertoire
The subrepertoire adopted shall be identified by the control function IDENTIFY GRAPHIC SUBREPERTOIRE
(IGS) which is defined in ISO/IEC 10538.
Parameter values identifying graphic character subrepertoires are registered in accordance with ISOAEC 7350.
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ISOIIEC 6937:1994 (E)
Table 1 - Primary and supplementary sets of graphic characters for text communication (coding when
represented by bit combinations 02/01 to 07/14 and lO/OO to M/15 of an 8-bit code)
0 1 2 3 4 5 6
7 8 9 A B C D F
- - - - - - - - - - - - - -
-
___I
‘.
‘_ ‘.:. ’ ; ,. '.
: :.
‘.’ ‘.” ‘.
.:. .I. . .
:
_’ ” \
:
:
0
‘. . ‘. :
.’ ‘.
: :.
:
0 ; ‘. 0 P NBSP
: " .
- @
” : ‘_ :_
,:. ‘. P ,’ '_
., ., ”
‘.
:
:
,.' ,o~.:': .:.,j6. 32. ._
48 64 80 96 112 .,,, '128 . ~,. ,144 160 176 >>'. j99: 208 224
-:::::.--- - 240
: '.
'. '. '.
:. : '.
'.
_' :
\
: _: l
1
1 l 1 A a
.'.". + A3
-
‘,,_ Q
: ., I
:
$j’$ I.‘:. 33
49 65 81 97
177 193 209 225 241
‘.
._
: .” ‘_
‘.
_’ :
‘. ‘., /
1v
‘. . .’
‘.
: 2
8
.“, ‘, .‘,
2 . . 2 R
B b r D d
-
‘_ ‘. ‘.
‘.
‘. ‘. :. ”
& 34
2”. 50 66 82 98 114 ,_, -a.: 136' 162 178 194 210 226
242
A
a
3 0
.’
3 _; 3 C S C
..*. # s a
-
.’
51 67 83 99 115 .,,A$~,' 147
~ 163 179 195 211 227 243
:
‘. u
4 4 D T d t X H h
$ '.
-
A&.: 36 52 68 84 100 116 ,_,. -& 132 _. j.j# ., 180 196 212 228
244
"'
-
.'
'.
_'
5 5 E U e u Y JJ
:,. .' 1
-
: '_ cc
53 69 85 101 181 197 213 ~ .&!i.:L 245
am
: v
1
F
6 6 V f V IJ
-
7
lJ
6 .&
38 54 86
70 102 118 :,, -A,, 1,: j.66. :'_. 182 198 214 230 246
'_
0
l
0 I l
7 7 G W W L 1
-
§
g
I
55 71 87 103 119 ,,y .a. .135 167 183 199
215 231 247
:
mm
0
-
II
l
H X h
8 8 x l J 1
-
56 72 88 104 120
,-A. 168 184 200 . 232 248
:.
l
6 9
:.
'.
9 9 I Y 1 0 0
-
Y
'. Q ':. I $5'
41 57 73 89 105 185 x 233
121 A??. .
...
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