1、CEN ENV*43503 93 = 3404589 0023254 8 W e. 22 , EUROPEAN PRESTANDARD -EHV 41501: 1991 PRENORME EUROPEENNE EUROPAISCHE VORNORH September 1991 UDC 621.397:681.304:003.62:681.327.8 Descriptors: Data processing, informat.ion .interchange, data transmission, videotex. coded character sets, . graphic chara
2、cter, directories, codification English Version Informatin systems interconnection - Graphic character repertoire for information received from or transmitted to CEPT Videotex services .or private videotex systems Interconnexion des Systemes Kommunikation temen - dinformation - Repertoires de Schr i
3、f tzeichenvorrat far Information, caracteres graphiques pour empfangen von oder bertragen zu CEPT linformation reue des ou envoyee aux Videotex-Diensten oder privaten Video- Systemes Videotex de la CEPT ou prives Systemen Informationssy This European Prestandard (ENVI was approved by CENICENELEC on
4、1991-04-16 as a prospective standard for provisional application. The period of validity of this ENV is limited initially to three years; After two years the members of CENICENELEC will be requested to submit their comments, particularly on the question whether the ENV can be converted into an EN. C
5、ENICENELEC members are required to announce the existence of this ENV in the same way as for an EN and to make the ENV available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the ENVI until the final decision abou
6、t the possible conversion of the ENV into an EN is reached. CENICENELEC members are the national standards bodies and national committees , respectively, of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,
7、 Switzerland and United Kingdom. CENICENELEC The joint European Standards Organization Organisation Commune Europenne de Normalisation Di Gemeinsame Europaische Normungsorganisation Central Secretariat: rue de Sta-ssart. 36 8-1050 Brussels (cl CENICENELEC 1991 Ref. No. ENV 41501:1991 E - Copyright r
8、eserved to all CEN and CENELEC members . CEN ENV*43503 93 m 3404589 0023255 T m 4 Page 2 ENV 41501:1991 Contents Page O 1 2 2.1 2.2 5.1 5.2 5.3 5.4 6 6.1 6.2 7 7.1 7.2 ,7.3 7.4 LITRO DUCTION 3 SCOPE AND FIELD OF APPLICATION . 3 REFERENCES . 3 Basic References . 4 Additidnal References 4 . DEFINITION
9、S . 5 ABBREVIATIONS . 6 SCENARIO DESCRIPTION 6 Repertoire option A . 7 Repertoire for the originating part of simple devices 7 CONFORMANCE 7 Conformance for Infomation Interchange 7 Conformance Repenoh option B 7 Repenoire option C 7 of Devices , 7 6.2.1. Device Description 7 CHARACTER REPERTOIRES .
10、 8 Repertoires for communication with CEPT Videotex Services . 8 7.1.1. Profile 1 8 7.1.2. Profile 2 . Latin 8 7.1.3. Profile 2 . Latin with Greek 8 7.1.4. Profile 3 Latin 8 7.1.5. Profile 3 . Latin with Greek 8 7.1.6. Profile 4 . Latin : . 8 7.1.7. Profile 4 . Latin with Greek 8 Latin graphic rqWtO
11、ke for use with private videotex systems 8 Latin/reek graphic repertoire for private videotex systems 9 Subrepertoires for originating part of terminai devices . 9 7.4.1. Repertoire for simple numeric keypad 9 7.4.2. Minimum repertoire for the alphanumeric keyboard 9 8 . IDENTIFICATION OF OPTIONS 9
12、9 . DEVICES 10 9.1. General . 10 9.2 Host devices 10 9.3 Terminal devices 10 9.4. Information Editor device 11 P Y CEN ENV*43503 93 m 3404589 O023256 1 m Page 3 ENV 41 501 : 1991 Foreword This European Prestandard (ENVI was drawn up by Working Group CEN/CLC/IT/WG/CSC (Secretariat held by SIS) which
13、had been established by the CEN/CENELEC/CEPT Information Technology Steering Committee (ITSTC) on 1985-07-17. Version 1 of this ENV was adopted by CEN/CENELEC on 1987-05-21. A revision process was initiated in 1989 and in accordance with the CEN/CENELEC Internal Regulations, clause 7.7. this second
14、version was adopted by CEN/CENELEC on 1991-04-16 on the strength of its acceptance by the following member countries : Denmark, France, Greece, Iceland, Sweden. CEN ENV*4i1503 93 3404584 0023257 3 = Page 4 ENV 41501:1991 O 1 2 INTRODUCTION The concept and structure of Functional Standards for Inform
15、ation Systems Interconnection are laid down in the CEN/CENELEC/CEPT Memorandum M-IT-01. The purpose of a Functional Standard is to recommend when and how certain information technology standards should be used. This Functional Standard specifies the graphic character repertoire designated as S/17 in
16、 the CEN/CENELEC/CEPT Memorandum M-IT-02 and an additional Greek repertoire. SCOPE AND FIELD OF APPLICATION This Functional Standard is intended to be used with and identified within other Functional Standards that specify strings of coded graphic characters forming the information received from or
17、transmitted to any of the components of CEPT Videotex SeMces, or for use in private systems using Videotex technology. For use with CEP“ Videotex Sentices, it specifies the repertoires according to the four recognized profiles specified in Annex C of ETS 300 072. For use in private Videotex-like sys
18、tems, it specifies repertoires with Latin, or with Latin and Greek alphabetic characters. This Functional Standard is intended to be used in conjunction with ENV 41 507. REFERENCES 2.1 Basic References IS0 4873 ISOLEC 6947 Information processing - IS0 8-bit code for information interchange - Structu
19、re and rules for implementation (1986) Information processing - Coded character sets for text communication (1990) ETS 300 072 ENV 41505 Videotex presentation layer protocol, Videotex presentation layer data syntax Information systems interconnection ; Character repertoire and coding for line drawin
20、g (1991) Infomation systems interconnection ; Data stream formats compatible with CEFT Videotex sewices and for private Videotex systems (1991) ENV 41507 2.2 Additionai References M-IT-O1 CEN/CENELEC/CEPT Memorandum on the Concept and Structure for Infoxmation Technology (March 1986) M-K-02 CEN/CEhr
21、ELEC/CEPT Memorandum on Directory of Function Standards (fourth issue, August 1989) CEx/CENELEC Report R-IT-O4 : European Functional Standards for character sets and their dg l i 1 CEN ENV*41501 91 3404589 0021258 5 Page 5 ENV 41501:1991 3 DEFiNITIONS The conformance clauses rely on the following ge
22、neralized definitions. CC-dataelement An element of interchanged information that is specified to consist of sequences of coded representations of characters, in accordance with one or more identified standards of coded character sets. Device A component of information processing equipment which can
23、 transmit, and/or can receive, coded information within CC-data-elements. (It may be-an input/output device in the conventional sense, or a process such as an application program or gateway function). In Videotex-like systems, a device may perform one or more of the following functions : - host (or
24、database server) : a component of a Videotex system which transmits, on request, pieces of information (e.g. pages of text, files, .) - terminal : a component of a Videotex system through which the user mnsmits a request to a host and which receives and presents the information to the user. (When th
25、e user is an application program, the information is presented as a suitably coded data stream) - service access point (not considered in this ENV) : acomponent of a Videotex system which acts as an interface (gateway) between an asynchronous terminal and an OSI-oriented network connecting database
26、servers - information editor (or database context editor) : a component of a Videotex system which provides a database server with information contents ready for distribution. Fall-back character A character within the repertoire of a receiving device, used to represent a received character that doe
27、s not belong to the repertoire of the device. Note : If possible, the fall-back character should be selected such that the graphic symbol conespondhg to it resembles the graphic symbol of the non-available character. Fully rendered subreriertok A subset of the repertoire which can be represented wit
28、hout the use of fall-back characters. It corresponds to the intersection of the given repertoire and the repertoire of the device. - User . A person or other entity that invokes the services provided by a device. (“his entity may be a process such as an application program if the “device“ is a code
29、convener or .a gateway function, for example). Other terms used in this Functional Standard are defined in the Reference Standards. CEN ENV*:4%501 31i Iiip 3434589 0023259 7 t. Page 6 ENV 41501:1991 4 ABBREVIATIONS The abbreviations used in this Functional Standard are defined in the Reference Stand
30、ards. 5 SCENARIO DESCRIPTION With the field of application as stated in section 1, the scenario for this Functional Standard provides character repertoires for the interfaces describeo as follows. . Videotex Terminal Interface (1) Host Interface (2) Videotex Information Provider I . Intexface ; (3)
31、I I I I I I. tor w /1 rransfor- Module 3a ransfor- mation Moduie 3b mation IPS 3 JI i When information prcxessing systems (IPS) work with character sets and coding in an 8-bit environment, and these systems need to communicate with components of the Videotex service or of a Videotex-like system, thi
32、s Functional Standard defines suitable coding interfaces between the Videotex network and msformation modules associated with IPSs acting in the functions of: *1: a texminai, e2 : a database semer, *3 and 4 : an information editor, In addition, a Videotex communication may be Terminai to Terminal It
33、 follows that the device to which conformance clause 6 applies is the transformation module (TM), and the user is the IPS. This model is only used for identification of repertoires to be used. The functional model considered in this Functional Standard is as follows : ,- 5.1 5.2 5.3 5.4 For each of
34、the above-mentioned interfaces, the Functional Standard specifies three different character repertoires : Repertoire option A is intended to be used for information to orfrom any of the components of public CEPT Videotex services. In that case, interface (4) is outside thescope of this Functional St
35、andard. This repertoire is further subdivided according to the profiles temgniaxi according to Annex C of ETS 300 072. Repertoire option B is intended to be used in private information processing systems using Videotex technology. It comprises Latin alphanumeric and special graphic characters. Reper
36、toire option C is intended to be used in private information processing systems using Videotex technology, It comprises Latin and Greek alphanumeric and special graphic characters. A fourth repertoire is defined for the originating part of simple devices connected to public EFT. Videotex services. 6
37、 CONFORMANCE 6.1 Conformance for Information Interchange A CC-data-element within coded information for interchange is in conformance with this standard if all the coded representations of characters within that CC-data- element conform to an identified standard, and represent characters that belong
38、 to an .identified repertoire as specified in clause 7. A claim of conformance shall identify the option adopted in accordance with clause a. 6.2 Conformance of Devices A-device is in conformance with this standard if it conforms to the requirements of clause 6.2.1, and of clause 9 below. A claim of
39、 conformance shall identify the document which contains the description specified in clause 6.2.1, and shall identify the applicable type of device from clause 9 and the option(s) adopted from clause 8. 6.2.1. Device Description A device that conforms to this standard shall be the subject of a descr
40、iption 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 in clause 9. Page 8 EM 41501:1991 CEN ENVU4LSOL 91 w 3404589 00212bL 5 . T 7 CHARACTER REPERTOIRES 7.1 Repertokes for communication with CEP
41、T Videotex Services CEPT Videotex Services have 6 repertoire profdes described in ETS 300 072. 7.1.1. Profile 1 : It comprises the fixed repertoire of alphanumeric characters, mosaic characters and line drawing characters as specified in part .1 of ETS. 300 072. Annex B together with the control fun
42、ctions of the serial mode and the parallel mode (described in clauses 1.3 to 1.5 of Annex B of ETS 300 072 and the DRCS capability (described in Part 4 of ETS 300 072). 7.1.2. Profile 2 - Latin : It comprises : a repertoire of 127 Latin characters including the 95 characters of the GO set of IS0 487
43、3 and 32 application defined characters chosen from among the other 219 characters listed in Tables 9 to 12 of ISO/iEC 6947 ; with the exception of the 4 following characters : broken line, not sign, non break space, soft hyphen, a repertoire of 63 block mosaic characters and the parallel control fu
44、nctions specified in clause 1.4.1 of Annex B of ETS 300 072. 7.1.3. Profile 2 - Latin with Greek : in addition to the characters specifidin clause 7.1.2, it comprises the 72 Greek characters defined in Table 13 of Past I of ETS 300 072. 7.1.4. Profile 3 : It comprises 95 simple alphanumeric characte
45、r (including SPACE) specified in clause 1.1.1. of part 1 of Annex B to ETS 300 072, and 63 block mosaic characters specified in cl 63 block mosaic characters specified in clause 1.2.1 ; and the serial control functions listed in clause 1.4.2. 7.1.7. Profile 4 - Latin with Greek : In addition to the
46、characters specified in clause 7.1.6, it comprises the 72 Greek characters defined in Table 13 of Part 1 of ETS 300 072. 7.2 Latin graphic repertoire for use with private videotex systems The Latin repertoire for private videotex system shall comprises 364 characters : - the character SPACE - the 33
47、4 graphic characters listed in Tables 4 to 12 of ISO/IEC 6937 - the 29 linedrawing/mosaic characters of the repertoire specified in ENV 41505 a- Al - CEN ENV*:41501 91 W 3404589 0023262 7 W Page 9 ENV 41501:1991 _ Repertoire for interworking with CEPT Videotex Services in profile 1 7.3 LatidGreek gr
48、aphic repertoire for private videotex systems The LatidGreek repertoire for private videotex systems shall comprise 434 characters : A21 - the 364 characters specified in clause 7.2 Repertoire for interworking with CEPT Videotex Services in profile 2 - Latin - the 72 Greek characters specified in Ta
49、ble 13 of ETS 300 072. A3 A4 1 7.4 Subrepextoires for originating part of terminai devices 7.4.1. Repertoire for simple numeric keypad It comprises the 10 numeric digits, plus the star symbol and number sign. Repertoire for interworking with CEPT Videotex Services in profile 3 Repertoire for interworking with CEPT Videotex Services in Drofile 4 - Lath 7.4.2. Minimum repertoire for the alphanumeric keyboard This minimum alphanumeric repertoire comprises the 26 upper case letters A-2 and the 10 numeric digits plus the following symbols : A42 B c star, numb
