1、 Reference number ISO/IEC 8825-5:2015(E) ISO/IEC 2015INTERNATIONAL STANDARD ISO/IEC 8825-5 Third edition 2015-11-15 Information technology ASN.1 encoding rules: Mapping W3C XML schema definitions into ASN.1 Technologies de linformation Rgles de codage ASN.1: Mappage en ASN.1 des dfinitions de schma
2、XML du W3C ISO/IEC 8825-5:2015(E) COPYRIGHT PROTECTED DOCUMENT ISO/IEC 2015 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet o
3、r an intranet, without prior written permission. Permission can be requested 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 copyrightiso.org Web www.i
4、so.org Published in Switzerland ii ISO/IEC 2015 All rights reservedISO/IEC 8825-5:2015(E) ISO/IEC 2015 All rights reserved iiiForeword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardiz
5、ation. National bodies that are members of ISO 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. ISO and IEC technical committees collaborate in fields of mutu
6、al interest. Other international organizations, governmental and non-governmental, 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 accordan
7、ce with the rules given in the ISO/IEC Directives, Part 2. The main task of the 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 Standa
8、rd requires approval by at least 75 % of the national bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. This third editi
9、on cancels and replaces the second edition of ISO/IEC 8825-5:2008 which has been technically revised. It also incorporates ISO/IEC 8825-5:2008/Cor.1:2012 and ISO/IEC 8825-5:2008.Cor.2:2014. ISO/IEC 8825-5 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee S
10、C 6, Telecommunications and information exchange between systems, in collaboration with ITU-T. The identical text is published as ITU-T X.694 (08/2015). International Telecommunication Union ITU-T X.694 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (08/2015) SERIES X: DATA NETWORKS, OPEN SYSTEM CO
11、MMUNICATIONS AND SECURITY OSI networking and system aspects Abstract Syntax Notation One (ASN.1) Information technology ASN.1 encoding rules: Mapping W3C XML schema definitions into ASN.1 Recommendation ITU-T X.694 ITU-T X-SERIES RECOMMENDATIONS DATA NETWORKS, OPEN SYSTEM COMMUNICATIONS AND SECURITY
12、 PUBLIC DATA NETWORKS Services and facilities X.1X.19 Interfaces X.20X.49 Transmission, signalling and switching X.50X.89 Network aspects X.90X.149 Maintenance X.150X.179 Administrative arrangements X.180X.199 OPEN SYSTEMS INTERCONNECTION Model and notation X.200X.209 Service definitions X.210X.219
13、Connection-mode protocol specifications X.220X.229 Connectionless-mode protocol specifications X.230X.239 PICS proformas X.240X.259 Protocol Identification X.260X.269 Security Protocols X.270X.279 Layer Managed Objects X.280X.289 Conformance testing X.290X.299 INTERWORKING BETWEEN NETWORKS General X
14、.300X.349 Satellite data transmission systems X.350X.369 IP-based networks X.370X.379 MESSAGE HANDLING SYSTEMS X.400X.499 DIRECTORY X.500X.599 OSI NETWORKING AND SYSTEM ASPECTS Networking X.600X.629 Efficiency X.630X.639 Quality of service X.640X.649 Naming, Addressing and Registration X.650X.679 Ab
15、stract Syntax Notation One (ASN.1) X.680X.699 OSI MANAGEMENT Systems management framework and architecture X.700X.709 Management communication service and protocol X.710X.719 Structure of management information X.720X.729 Management functions and ODMA functions X.730X.799 SECURITY X.800X.849 OSI APP
16、LICATIONS Commitment, concurrency and recovery X.850X.859 Transaction processing X.860X.879 Remote operations X.880X.889 Generic applications of ASN.1 X.890X.899 OPEN DISTRIBUTED PROCESSING X.900X.999 INFORMATION AND NETWORK SECURITY X.1000X.1099 SECURE APPLICATIONS AND SERVICES X.1100X.1199 CYBERSP
17、ACE SECURITY X.1200X.1299 SECURE APPLICATIONS AND SERVICES X.1300X.1399 CYBERSECURITY INFORMATION EXCHANGE X.1500X.1599 CLOUD COMPUTING SECURITY X.1600X.1699 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T X.694 (08/2015) i INTERNATIONAL STANDARD ISO/IEC 8825-5 REC
18、OMMENDATION ITU-T X.694 Information technology ASN.1 encoding rules: Mapping W3C XML schema definitions into ASN.1 Summary Recommendation ITU-T X.694 | ISO/IEC 8825-5 defines rules for mapping an XSD Schema (a schema conforming to the W3C XML Schema specification) to an ASN.1 schema in order to use
19、ASN.1 encoding rules such as the Basic Encoding Rules (BER), the Distinguished Encoding Rules (DER), the Packed Encoding Rules (PER) or the XML Encoding Rules (XER) for the transfer of information defined by the XSD Schema. The use of this Recommendation | International Standard with the ASN.1 Exten
20、ded XML Encoding Rules (EXTENDED- XER) provides the same XML representation of values as that defined by the original XSD Schema, but also provides the ability to encode the specified XML with an efficient binary representation (binary XML). An XML document can be converted to binary XML (for storag
21、e or transfer) using the ASN.1 generated by this mapping, and the resulting binary can be converted back to the same XML document for further XML processing. Two versions of the mapping are defined. Version 1 of the mapping was published in 2004, and a Corrigendum was subsequently issued renaming th
22、e types DATE-TIME and DURATION in Annex A (in order to avoid conflict with the DATE-TIME and DURATION types defined in Rec. ITU-T X.680 | ISO/IEC 8824-1). The Version 2 mapping is more efficient in two areas: the ASN.1 time types are used rather than VisibleString for mappings of dates and times; th
23、e FastInfoset specification (Rec. ITU-T X.891 | ISO/IEC 24824-1) is used for the mapping of XSD wild-cards. Both these changes to the mapping provide much more compact binary encodings for the XML specified by the XSD. NOTE The specification of the Version 1 mapping (with applicable corrections) wil
24、l be maintained in the next edition of this Recommendation | International Standard, but it is expected that subsequent editions will document only the Version 2 mapping. Application of the ASN.1 extended XML Encoding Rules to both versions of the mapping will produce the same XML (which is the same
25、 as that specified by the XSD). However, application of other ASN.1 encoding rules to the Version 1 mapping results in a verbose character-based encoding of date and time types and of XSD wild-cards, whilst application of the Version 2 mapping results in a more compact binary encoding using ASN.1 ti
26、me types and the FastInfoset specification. History Edition Recommendation Approval Study Group Unique ID *1.0 ITU-T X.694 2004-01-13 17 11.1002/1000/7106 1.1 ITU-T X.694 (2004) Technical Cor. 1 2005-11-29 17 11.1002/1000/8639 1.2 ITU-T X.694 (2004) Amd. 1 2007-05-29 17 11.1002/1000/9111 2.0 ITU-T X
27、.694 2008-11-13 17 11.1002/1000/9612 2.1 ITU-T X.694 (2008) Cor. 1 2011-10-14 17 11.1002/1000/11382 2.2 ITU-T X.694 (2008) Cor. 2 2014-03-01 17 11.1002/1000/12149 3.0 ITU-T X.694 2015-08-13 17 11.1002/1000/12486 _ *To access the Recommendation, type the URL http:/handle.itu.int/ in the address field
28、 of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T X.694 (08/2015) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information an
29、d communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide ba
30、sis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Reso
31、lution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration
32、 and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions ar
33、e met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the po
34、ssibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of th
35、e Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest info
36、rmation and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2015 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T X.694 (08/2015) iii CONTENTS Page
37、 1 Scope 1 2 Normative references . 1 2.1 Identical Recommendations | International Standards 1 2.2 Additional references 2 3 Definitions 2 3.1 Imported definitions 2 3.2 Additional definitions 3 4 Abbreviations . 3 5 Notation 3 6 Purpose and extent of standardization 3 7 Mapping XSD Schemas . 4 8 I
38、gnored schema components and properties . 5 9 ASN.1 modules 6 10 Name conversion 6 10.1 General 6 10.2 Generating ASN.1 type definitions that are references to ASN.1 type assignments . 7 10.3 Generating identifiers and type reference names 7 10.4 Order of the mapping 9 11 Mapping uses of XSD built-i
39、n types 10 12 Mapping facets 10 12.1 The length, minLength, and maxLength facets 11 12.2 The pattern facet. 11 12.3 The whiteSpace facet 1 1 12.4 The enumeration facet . 1 2 12.5 Other facets . 14 13 Mapping simple type definitions . 14 14 Mapping element declarations . 16 15 Mapping attribute decla
40、rations . 17 16 Mapping values of simple type definitions . 17 17 Mapping model group definitions . 17 18 Mapping model groups . 17 19 Mapping particles 18 20 Mapping complex type definitions . 19 21 Mapping wildcards . 20 22 Mapping attribute uses 22 23 Mapping uses of simple and complex type defin
41、itions (general case) . 22 24 Mapping special uses of simple and complex type definitions (substitutable) . 2 3 25 Mapping special uses of simple and complex type definitions (substitutable, nillable) . 24 26 Mapping special uses of simple type definitions (nillable) . 25 27 Mapping special uses of
42、complex type definitions (nillable) 26 28 Mapping special uses of element declarations (head of element substitution group) 27 29 Generating special ASN.1 type assignments for types used in element declarations 27 30 Generating special ASN.1 type assignments for types belonging to a derivation hiera
43、rchy 29 31 Generating special ASN.1 type assignments for element substitution groups 29 Annex A ASN.1 type definitions corresponding to XSD built-in types for the Version 1 mapping 30 Annex B ASN.1 type definitions corresponding to XSD built-in types for the Version 2 mapping. 34 iv Rec. ITU-T X.694
44、 (08/2015) Page Annex C Identification of the XSD module . 38 Annex D Examples of mappings 39 D.1 A Schema using simple type definitions 39 D.2 The corresponding ASN.1 definitions . 40 D.3 Further examples . 41 Annex E Use of the mapping to provide binary encodings for W3C XML Schema 61 E.1 Encoding
45、 XSD Schemas . 61 E.2 Transfer without using the XSD Schema for Schemas . 61 E.3 Transfer using the XSD Schema for Schemas 6 1 Rec. ITU-T X.694 (08/2015) v Introduction This Recommendation | International Standard specifies Version 1 and Version 2 of a mapping from a W3C XML Schema definition (an XS
46、D Schema) into an ASN.1 schema. The mappings can be applied to any XSD Schema. Both mappings specify the generation of one or more ASN.1 modules containing type definitions, together with ASN.1 XER encoding instructions. These are jointly described as an ASN.1 schema for XML documents. This ASN.1 sc
47、hema (produced by either Version of the mapping), when used with the ASN.1 Extended XML Encoding Rules (EXTENDED-XER), can be used to generate and to validate the same set of W3C XML 1.0 documents as the original XSD Schema. The resulting ASN.1 types and encodings support the same semantic content a
48、s the XSD Schema. Thus ASN.1 tools can be used interchangeably with XSD tools for the generation and processing of the specified XML documents. Other standardized ASN.1 encoding rules, such as the Distinguished Encoding Rules (DER) or the Packed Encoding Rules (PER), can be used in conjunction with
49、this standardized mapping, but produce encodings for Version 2 of the mapping that differ from (and are less verbose than) those produced by Version 1 for XSD constructs involving dates and times or wildcards. The combination of this Recommendation | International Standard with ASN.1 Encoding Rules provides fully- standardized and vendor-independent compact and canonical binary encodings for data originally defined using an XSD Schema. The ASN.1 schema provides a clear separation betwe
