BS EN 1923-1998 European character repertoires and their coding - 8-bit single-byte coding《欧洲字符集及其编码 8位单字节编码》.pdf

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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1923:1998 The Europ

2、ean Standard EN 1923:1998 has the status of a British Standard ICS 35.040 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW European character repertoires and their coding 8-bit single-byte codingBS EN 1923:1998 This British Standard, having been prepared under the direction of

3、the DISC Board, was published under the authority of the Standards Committee and comes into effect on 15 November 1998 BSI 1998 ISBN 0 580 30051 X Amendments issued since publication Amd. No. Date Text affected National foreword This British Standard is the English language version of EN 1923:1998.

4、It supersedes DD ENV 41503:1991, DD ENV 41505:1991 and DD ENV 41508:1991, which have been withdrawn. The UK participation in its preparation was entrusted to Technical Committee IST/2, Character sets and information coding, which has the responsibility to: aid enquirers to understand the text; prese

5、nt to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on r

6、equest to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility o

7、f the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.

8、 Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 6, an inside back cover and a back cover.CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart

9、36, B-1050 Brussels 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1923:1998 E EUROPEAN STANDARD EN 1923 NORME EUROPE ENNE EUROPA ISCHE NORM April 1998 ICS 35.040 Supersedes ENV 41503, ENV 41505, ENV 41508 Descriptors: data p

10、rocessing, information interchange, data transmission, character sets, coded character sets, graphic characters, directories, codification English version European character repertoires and their coding 8-bit single-byte coding Europa ische Zeichenvorra te und deren Codierungen 8-Bit-Einzelbyte-Codi

11、erung This European Standard was approved by CEN on 3 April 1998. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical

12、references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN memb

13、er into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portu

14、gal, Spain, Sweden, Switzerland and United Kingdom.Page 2 EN 1923:1998 BSI 1998 Foreword This European Standard has been prepared by Technical Committee CEN/TC 304, Character set technology, the Secretariat of which is held by STRI. This European Standard replaces ENV 41503, ENV 41505, ENV 41508 (dr

15、awn up by CEN/CENELEC/IT/WG-CSC). This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 1998, and conflicting national standards shall be withdrawn at the latest by October 1998. This European S

16、tandard differs from the earlier version of ENV 41503 of December 1990 in the following main aspects. The base standard for the repertoires of this EN is now ISO/IEC 10646-1 (in place of ISO 646 and the parts of ISO 8859). The coding is based on the latest edition of ISO/IEC 4873. There are more com

17、binations of character repertoires and only one coding method available in this European Standard. The symbols repertoire has been added to meet requirements expressed by users. The coding method of ISO 6937 is now excluded. The standard is only available in English and German. According to the CEN/

18、CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,

19、 Switzerland and the United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Definitions 3 4 Abbreviations 3 5 Scenario description 3 6 Conformance 4 6.1 Conformance for information interchange 4 6.2 Conformance of devices 4 7 Repertoire description 4 7.1 Latin script 4 7.2 Gre

20、ek script 4 7.3 Cyrillic script 4 7.4 The symbols repertoire 4 8 Coding methods applicable 4 8.1 Eight-bit single-byte coding 4 8.2 Formation of G-sets 5 9 Identification of options 6Page 3 EN 1923:1998 BSI 1998 1 Scope This European Standard specifies the graphic character repertoires and their sin

21、gle-byte coding, which are available for use for information interchange between information processing systems and for use within such systems, in the scripts that are commonly used by the members of CEN/CENELEC and the Institutions of the European Union and the European Free Trade Association. Thi

22、s European Standard does not specify the interchange of information using a telematic service. The character repertoire and the coding used by a telematic service are defined by the specification of that service. The transmission of information based on the specifications of this European Standard u

23、sing a telematic service may necessitate an adaptation of the number of characters of a repertoire (repertoire transformation function) or a change to the coding (code transformation function). 2 Normative references This European Standard incorporates by dated or undated reference, provisions from

24、other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated by amendment or re

25、vision. For undated references, the latest edition of the publication referred to applies. ISO/IEC 2022:1994, Information technology Character code structure and extension techniques. ISO 2375:1985, Data processing Procedure for registration of escape sequences. ISO/IEC 4873:1994, Information techno

26、logy ISO 8-bit code for information interchange Structure and rules for implementation. ISO/IEC 10367:1990, Information technology Standardized coded graphic character sets for use in 8-bit codes. ISO/IEC 10646-1:1993, Information technology Universal multiple-octet coded character set (UCS) Part 1:

27、 Architecture and basic multilingual plane. 3 Definitions For the purposes of this standard, the definitions of ISO/IEC 10646-1:1993 and the following definitions apply. 3.1 CC-data-element an element of interchanged information that is specified to consist of sequences of coded representations of c

28、haracters, in accordance with one or more identified standards of coded character sets 3.2 device a component of information processing equipment which can transmit, and/or can receive, coded information within CC-data-elements (it may be an input/output device in the conventional sense, or a proces

29、s such as an application program or gateway function) 3.3 user a person or other entity that invokes the services provided by a device (this entity may be a process such as an application program if the “device” is a code converter or a gateway function, for example) 3.4 G-set the same as “coded gra

30、phic character set” in ISO/IEC 2022:1994 4 Abbreviations The notation used for the character repertoires in clause 7 is as follows. 4.1 BMP stands for “basic multilingual plane”, as defined in ISO/IEC 10646-1:1993 4.2 Rowxy refers to Row xy of ISO/IEC 10646-1:1993 4.3 Tablexy refers to Table xy of I

31、SO/IEC 10646-1:1993 4.4 Positionab-to-cd refers to a range of code positions from ab to cd (hex format) within the Table xy 5 Scenario description 5.1 Repertoires There are four collections of graphic characters identified in this European Standard, comprising the characters needed for the: Latin sc

32、ript; Greek script; Cyrillic script; symbols repertoire. These collections are further divided into repertoires as described in clause 7.Page 4 EN 1923:1998 BSI 1998 5.2 Combinations of repertoires and their coding This European Standard identifies combinations of character repertoires and their cod

33、ing as options. An option identified in this European Standard defines only the minimum requirements, in terms of character repertoire and coding, applied to a conforming device. Additional capabilities of the originating or receiving device may be used, during the information interchange, subject t

34、o bilateral agreement. 8-bit single-byte coding shall be a version of ISO/IEC 4873:1994, clause 9. NOTE This European Standard is intended to be used with other standards specifying control functions, as needed by the base coding standards. 6 Conformance 6.1 Conformance for information interchange A

35、 CC-data-element within coded information for interchange is in conformance with this standard if all the coded representations of graphic characters within that CC-data-element conform to the requirements of clauses 7 and 8. A claim of conformance shall identify the option adopted according to clau

36、se 9. 6.2 Conformance of devices 6.2.1 General A device is in conformance with this standard if it conforms to the requirements of 6.2.2, and either or both of 6.2.3 and 6.2.4. A claim of conformance shall identify the document which contains the description specified in 6.2.2, and shall identify th

37、e option adopted. 6.2.2 Device description A device that conforms to this 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 him, as specified respectively in 6.2.3 and

38、6.2.4. 6.2.3 Originating devices An originating device shall allow its user to supply any sequence of graphic characters from the option adopted, and shall be capable of transmitting their coded representations within a CC-data-element. 6.2.4 Receiving devices A receiving device shall be capable of

39、receiving and interpreting any coded representations of graphic characters that are within a CC-data-element, and that conform to 6.1, and shall make the corresponding characters available to the user in such a way that the user can identify them from among those conforming to the option adopted, an

40、d can distinguish them from each other. 7 Repertoire description 7.1 Latin script Four subsets of this collection of graphic characters are identified, each with a subset/superset relation with the others. These subsets are the following. 7.1.1 The Invariant-Latin repertoire, containing 83 character

41、s as specified in the BMP-Row00-Table01-Position20-to-22, 25-to-3F, 41-to-5A, 5F, 61-to-7A of ISO/IEC 10646-1:1993 (Repertoire IVL). 7.1.2 The Initial-Latin repertoire, containing 95 characters as specified in the BMP-Row00-Table01 of ISO/IEC 10646-1:1993 (Repertoire IL). It is a true superset of th

42、e Invariant-Latin repertoire (Repertoire IVL). 7.1.3 The Basic-Latin repertoire, comprising the Initial repertoire plus the repertoire of Latin-1 Supplement as specified in the BMP-Row00-Table02 of ISO/IEC 10646-1:1993. It is a true superset of the Initial repertoire (Repertoire BL). 7.1.4 The Large

43、-Latin-8 repertoire for the 8-bit environment, comprising the union of the Basic-Latin repertoire with the repertoire consisting of the Latin characters coded in ISO/IEC 10367:1990. It is a true superset of the Basic-Latin repertoire (Repertoire LL8). 7.2 Greek script In the 8-bit environment, only

44、one Greek repertoire is defined, which is: 7.2.1 The Basic-Greek repertoire, comprising the characters defined in the BMP-Row03-Table09 of ISO/IEC 10646-1:1993 (Repertoire BG). 7.3 Cyrillic script In the 8-bit environment, only one Cyrillic repertoire is defined, which is: 7.3.1 The Basic-Cyrillic r

45、epertoire, comprising the characters defined in the BMP-Row04-Table11-Position01-to-5F of ISO/IEC 10646-1:1993 (Repertoire BC). 7.4 The symbols repertoire This repertoire shall comprise the characters defined in Registration 155 of ISO 2375:1985. These characters are derived from BMP-Row25-Table45 a

46、nd BMP-Row25-Table46 of ISO/IEC 10646-1:1993 (Repertoire BS). 8 Coding methods applicable 8.1 Eight-bit single-byte coding 8.1.1 Each character shall be coded by the use of a single byte. No control function shall be used that would cause characters within a repertoire to be combined to represent an

47、y other character. 8.1.2 The various repertoires shall form G-sets, according to the relevant provisions of ISO/IEC 2022:1994.Page 5 EN 1923:1998 BSI 1998 8.1.3 When code extension techniques are applied, then the provisions of ISO/IEC 4873:1994 shall be followed. The application should always confo

48、rm to a certain level of ISO/IEC 4873:1994. 8.1.4 When code extension techniques are applied, then all the necessary control functions shall exist, coded as specified in ISO/IEC 4873:1994. 8.2 Formation of G-sets The characters belonging to the repertoires defined in clause 7 shall be arranged to th

49、e code table positions and shall form G-sets as follows. 8.2.1 The IVL repertoire shall always form a G0 code element in a version of ISO/IEC 4873:1994. The characters shall be arranged in the code table as specified in BMP-Row00-Table01-Position20-to-22, 25-to-3F, 41-to-5A, 5F, 61-to-7A of ISO/IEC 10646-1:1993. The Row octet will be omitted and each character will be coded by the use of the Cell octet only. The escape sequence to designate this set will be: ESC 02/08 02/01 04/02. 8.2.2 The IL repertoire shall always form a G0