1、 Reference numberISO/IEC 15475-3:2002(E)ISO/IEC 2002Information technology CDIF transfer format Part 3: Encoding ENCODING.1 Technologies de linformation Format de transfert CDIF Partie 3: Codage ENCODING.1 National Standard of CanadaCAN/CSA-ISO/IEC 15475-3:04(ISO/IEC 15475-3:2002)International Stand
2、ard ISO/IEC 15475-3:2002 (first edition, 2002-11-01) has been adopted without modification(IDT) as CSA Standard CAN/CSA-ISO/IEC 15475-3:04, which has been approved as a National Standard of Canadaby the Standards Council of Canada.ISBN 1-55397-344-5 January 2004The Canadian Standards Association (CS
3、A), The Standards Council of Canada is theunder whose auspices this National Standard has been coordinating body of the National Standards system, produced, was chartered in 1919 and accredited by a federation of independent, autonomousthe Standards Council of Canada to the National organizations wo
4、rking towards the furtherStandards system in 1973. It is a not-for-profit, development and improvement of voluntarynonstatutory, voluntary membership association standardization in the national interest.engaged in standards development and certification The principal objects of the Council are to fo
5、ster activities. and promote voluntary standardization as a means CSA standards reflect a national consensus of of advancing the national economy, benefiting theproducers and users including manufacturers, health, safety, and welfare of the public, assisting consumers, retailers, unions and professi
6、onal and protecting the consumer, facilitating domestic organizations, and governmental agencies. The and international trade, and furthering internationalstandards are used widely by industry and commerce cooperation in the field of standards.and often adopted by municipal, provincial, and A Nation
7、al Standard of Canada is a standard whichfederal governments in their regulations, particularly in has been approved by the Standards Council ofthe fields of health, safety, building and construction, Canada and one which reflects a reasonableand the environment. agreement among the views of a numbe
8、r of capableIndividuals, companies, and associations across individuals whose collective interests provide to theCanada indicate their support for CSAs standards greatest practicable extent a balance ofdevelopment by volunteering their time and skills to representation of producers, users, consumers
9、, andCSA Committee work and supporting the Associations others with relevant interests, as may be appropriateobjectives through sustaining memberships. The more to the subject in hand. It normally is a standardthan 7000 committee volunteers and the 2000 which is capable of making a significant and t
10、imelysustaining memberships together form CSAs total contribution to the national interest.membership from which its Directors are chosen. Approval of a standard as a National Standard ofSustaining memberships represent a major source of Canada indicates that a standard conforms to theincome for CSA
11、s standards development activities. criteria and procedures established by the StandardsThe Association offers certification and testing Council of Canada. Approval does not refer to theservices in support of and as an extension to its technical content of the standard; this remains thestandards dev
12、elopment activities. To ensure the continuing responsibility of the accreditedintegrity of its certification process, the Association standards-development organization.regularly and continually audits and inspects products Those who have a need to apply standards arethat bear the CSA Mark. encourag
13、ed to use National Standards of CanadaIn addition to its head office and laboratory complex whenever practicable. These standards are subject in Toronto, CSA has regional branch offices in major to periodic review; therefore, users are cautioned centres across Canada and inspection and testing to ob
14、tain the latest edition from the organizationagencies in eight countries. Since 1919, the preparing the standard.Association has developed the necessary expertise to The responsibility for approving National Standards meet its corporate mission: CSA is an independent of Canada rests with theservice
15、organization whose mission is to provide an Standards Council of Canadaopen and effective forum for activities facilitating the 270 Albert Street, Suite 200exchange of goods and services through the use of Ottawa, Ontario, K1P 6N7standards, certification and related services to meet Canadanational a
16、nd international needs.For further information on CSA services, write toCanadian Standards Association5060 Spectrum Way, Suite 100Mississauga, Ontario, L4W 5N6CanadaAlthough the intended primary application of this Standard is stated in its Scope, it is importantto note that it remains the responsib
17、ility of the users to judge its suitability for their particular purpose.Registered trade-mark of Canadian Standards AssociationCAN/CSA-ISO/IEC 15475-3:04 Information technology CDIF transfer format Part 3: Encoding ENCODING.1January 2004 Canadian Standards Association CSA/1CAN/CSA-ISO/IEC 15475-3:0
18、4Information technology CDIFtransfer format Part 3: EncodingENCODING.1CSA PrefaceStandards development within the Information Technology sector is harmonized with internationalstandards development. Through the CSA Technical Committee on Information Technology (TCIT),Canadians serve as the Canadian
19、Advisory Committee (CAC) on ISO/IEC Joint Technical Committee 1 onInformation Technology (ISO/IEC JTC1) for the Standards Council of Canada (SCC), the ISO memberbody for Canada and sponsor of the Canadian National Committee of the IEC. Also, as a member of theInternational Telecommunication Union (I
20、TU), Canada participates in the International Telegraph andTelephone Consultative Committee (ITU-T).This International Standard was reviewed by the CSA TCIT under the jurisdiction of the StrategicSteering Committee on Information Technology and deemed acceptable for use in Canada. (Acommittee member
21、ship list is available on request from the CSA Project Manager.) From time to time,ISO/IEC may publish addenda, corrigenda, etc. The CSA TCIT will review these documents for approvaland publication. For a listing, refer to the CSA Information Products catalogue or CSA Info Update orcontact a CSA Sal
22、es representative. This Standard has been formally approved, without modification, bythe Technical Committee and has been approved as a National Standard of Canada by the StandardsCouncil of Canada.January 2004 Canadian Standards Association 2004All rights reserved. No part of this publication may b
23、e reproduced in any form whatsoever without the prior permission ofthe publisher. ISO/IEC material is reprinted with permission. Where the words “this International Standard” appear in thetext, they should be interpreted as “this National Standard of Canada”.Inquiries regarding this National Standar
24、d of Canada should be addressed to Canadian Standards Association 5060 Spectrum Way, Suite 100, Mississauga, Ontario, Canada L4W 5N6 1-800-463-6727 416-747-4044www.csa.caReference numberISO/IEC 15475-3:2002(E)ISO/IEC 2002INTERNATIONAL STANDARD ISO/IEC15475-3First edition2002-11-01Information technol
25、ogy CDIF transfer format Part 3: Encoding ENCODING.1 Technologies de linformation Format de transfert CDIF Partie 3: Codage ENCODING.1 ISO/IEC 15475-3:2002(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed b
26、ut shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobes licensing policy. The ISO Central Secretariat accepts no liability in this
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28、se by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO/IEC 2002 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means
29、, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrig
30、htiso.org Web www.iso.org ii ISO/IEC 2002 All rights reservedISO/IEC 15475-3:2002(E) ISO/IEC 2002 All rights reserved iiiContents 1 Scope . 1 2 Conformance . 2 3 Normative references 2 4 Terms and definitions . 3 4.1 From other standards 3 4.1.1 ISO/IEC 15474-1 . 3 4.1.2 ISO/IEC 15475-1 . 4 4.1.3 IS
31、O/IEC 13238-1 . 4 4.2 For this standard . 4 5 Symbols (and abbreviated terms). 4 5.1 Naming and diagramming notations 4 5.2 BNF conventions. 4 5.3 Abbreviations 5 6 CDIF transfer concepts and facilities . 5 6.1 Encoding identifier 5 6.2 Clear text 5 6.3 Character sets . 5 7 Encoding structures and k
32、eywords in the CDIF transfer. 6 7.1 Introduction . 6 7.2 Encoding structures 6 7.2.1 Decimal integer value 6 7.2.2 Binary value. 6 7.2.3 Octal value. 6 7.2.4 Hexadecimal value 7 7.2.5 Float value . 7 7.2.6 Date 7 7.2.7 Time . 8 7.2.8 Identifier value. 8 7.2.9 Enumerated value 9 7.2.10 String 9 7.2.1
33、1 Text string 9 7.2.12 Comment 11 7.2.13 Meta-meta-object name. 12 7.2.14 Meta-object name 12 7.2.15 Identifier. 12 7.2.16 Multibyte identifier. 13 7.3 Keywords. 13 Annex A (normative) ENCODING.1 formal grammar 14 Annex B (informative) Multibyte examples. 19 B.1 Example of 7.2.9 Enumerated value . 1
34、9 B.2 Example of 7.2.10 String . 19 B.3 Example of 7.2.11 Text string 19 B.4 Example of 7.2.12 Comment . 20 B.5 Example of 7.2.16 Multibyte identifier. 20 ISO/IEC 15475-3:2002(E) iv ISO/IEC 2002 All rights reserved Table of Illustrations Figure 1 Position in the CDIF family of standards 1 ISO/IEC 15
35、475-3:2002(E) ISO/IEC 2002 All rights reserved vForeword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the devel
36、opment of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmen
37、tal, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. The main task of th
38、e joint technical committee is to prepare International Standards. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote. A
39、ttention is drawn to the possibility that some of the elements of this part of ISO/IEC 15475 may be the subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. ISO/IEC 15475-3 was prepared by Joint Technical Committee ISO/IEC JTC 1, Informat
40、ion technology, Subcommittee SC 7, Software and system engineering. ISO/IEC 15475 consists of the following parts, under the general title Information technology CDIF transfer format : Part 1: General rules for syntaxes and encodings Part 2: Syntax SYNTAX.1 Part 3: Encoding ENCODING.1 Annex A forms
41、a normative part of this part of ISO/IEC 15475. Annex B is for information only. ISO/IEC 15475-3:2002(E) vi ISO/IEC 2002 All rights reserved Introduction This standard will assist the vendors and users of modelling tools and metadata repositories in developing mechanisms for interchanging informatio
42、n. This standard specifies an element of a family of related standards. When used together, these standards specify a mechanism for transferring information between tools. ISO/IEC 15474-1:2002, Information technology CDIF framework Part 1: Overview and ISO/IEC 15474-2:2002, Information technology CD
43、IF framework Part 2: Modelling and extensibility should be read first when initially exploring CDIF. The first explains the overall CDIF Architecture and how the family of standards fits together. The second explains the scope, and modelling approach in CDIF. The CDIF meta-metamodel and extensibilit
44、y mechanisms are also defined in that document. This standard defines an encoding of SYNTAX.1. ISO/IEC 15475-1:2002, Information technology CDIF transfer format Part 1: General rules for syntaxes and encodings describes how CDIF supports multiple syntaxes and encodings. ISO/IEC 15475-2:2002, Informa
45、tion technology CDIF transfer format Part 2: Syntax SYNTAX.1 defines the initial CDIF transfer format syntax, SYNTAX.1. This standard has been developed with the wide support and participation of vendors, users, academia and government involved in or familiar with the CASE industry, its products and
46、 the general requirements associated with interchanging information between these products. This document is organized into the following Clauses: Clause 6: Concepts and facilities This specifies the unique identifier for the encoding defined in this document and describes the concepts of clear text
47、 and character sets used in this document. Clause 7: Encoding structures and keywords in the CDIF transfer This Clause describes and gives examples of the format of transfer syntax terminals and lists the encodings of keywords. Annex A (normative): ENCODING.1 formal grammar This annex defines the en
48、coding rules for all non-terminals in the encoding. Annex B (informative): Multibyte examples Supplementary Examples using multibyte codeset encoding are provided. INTERNATIONAL STANDARD ISO/IEC 15475-3:2002(E) ISO/IEC 2002 All rights reserved 11 Scope The CDIF family of standards is primarily desig
49、ned to be used as a description of a mechanism for transferring information between modelling tools. It facilitates a successful transfer when the authors of the importing and exporting tools have nothing in common except an agreement to conform to CDIF. The language that is defined for the transfer format also has applicability as a general language for Import/Export from repositories. The CDIF semantic metamodel defined for modelling tools also has applicability as the basis of stan
