1、 Reference number ISO/IEC 8824-3:2015(E) ISO/IEC 2015INTERNATIONAL STANDARD ISO/IEC 8824-3 Fifth edition 2015-11-15 Information technology Abstract Syntax Notation One (ASN.1): Constraint specification Technologies de linformation Notation de syntaxe abstraite numro un (ASN.1): Spcification des cont
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4、org Published in Switzerland ii ISO/IEC 2015 All rights reservedISO/IEC 8824-3:2015(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 standardizati
5、on. 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 mutual
6、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 accordance
7、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 Standard
8、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 fifth edition
9、cancels and replaces the fourth edition of ISO/IEC 8824-3:2008 which has been technically revised. It also incorporates ISO/IEC 8824-3:2008/Cor.1:2014. ISO/IEC 8824-3 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology Subcommittee SC 6, Telecommunications and information
10、 exchange between systems, in collaboration with ITU-T. The identical text is published as ITU-T X.682 (08/2015). I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T X.682 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (08/2015) SERIES X: DATA NETWORKS, OPEN SYSTEM COMMUNICA
11、TIONS AND SECURITY OSI networking and system aspects Abstract Syntax Notation One (ASN.1) Information technology Abstract Syntax Notation One (ASN.1): Constraint specification Recommendation ITU-T X.682 ITU-T X-SERIES RECOMMENDATIONS DATA NETWORKS, OPEN SYSTEM COMMUNICATIONS AND SECURITY PUBLIC DATA
12、 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 Connection-m
13、ode 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.300X.349 Sa
14、tellite 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 Abstract Synta
15、x 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 APPLICATIONS Co
16、mmitment, 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 CYBERSPACE SECURITY
17、 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.682 (08/2015) i INTERNATIONAL STANDARD ISO/IEC 8824-3 RECOMMENDATION
18、ITU-T X.682 Information technology Abstract Syntax Notation One (ASN.1): Constraint specification Summary Recommendation ITU-T X.682 | ISO/IEC 8824-3 provides the ASN.1 notation for the general case of constraint and exception specification by which the data values of a structured data type can be l
19、imited. The notation also provides for signalling if and when a constraint is violated. History Edition Recommendation Approval Study Group Unique ID *1.0 ITU-T X.682 1994-07-01 7 11.1002/1000/3044 2.0 ITU-T X.682 1997-12-12 7 11.1002/1000/4445 2.1 ITU-T X.682 (1997) Technical Cor. 1 2000-03-31 7 11
20、.1002/1000/5047 2.2 ITU-T X.682 (1997) Technical Cor. 2 2001-02-02 7 11.1002/1000/5334 2.3 ITU-T X.682 (1997) Technical Cor. 3 2001-03-15 7 11.1002/1000/5434 3.0 ITU-T X.682 2002-07-14 17 11.1002/1000/6087 4.0 ITU-T X.682 2008-11-13 17 11.1002/1000/9606 4.1 ITU-T X.682 (2008) Cor. 1 2014-03-01 17 11
21、.1002/1000/12145 5.0 ITU-T X.682 2015-08-13 17 11.1002/1000/12481 *To access the Recommendation, type the URL http:/handle.itu.int/ in the address field 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.682 (08/20
22、15) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for
23、studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study
24、groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis wi
25、th ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory prov
26、isions (to ensure, e.g., interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of
27、such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no posi
28、tion concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, prote
29、cted by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information 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 o
30、f this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T X.682 (08/2015) iii CONTENTS Page Introduction . iv Information technology Abstract Syntax Notation One (ASN.1): Constraint specification . 1 1 Scope 1 2 Normative references 1 2.1
31、Identical Recommendations | International Standards . 1 3 Definitions 1 3.1 Specification of basic notation 1 3.2 Information object specification 1 3.3 Parameterization of ASN.1 specification 1 3.4 Additional definitions 1 4 Abbreviations . 2 5 Convention . 2 6 Notation 2 6.1 Constraint 2 7 ASN.1 l
32、exical items 2 7.1 Additional keywords . 2 8 General constraint specification . 2 9 User-defined constraints . 3 10 Table constraints, including component relation constraints 4 11 Contents constraints 7 Annex A Constraining instance-of types . 8 A.4 Example 8 Annex B Summary of the notation . 9 iv
33、Rec. ITU-T X.682 (08/2015) Introduction Application designers require a notation to define a structured data type to convey their semantics. This is provided in Rec. ITU-T X.680 | ISO/IEC 8824-1 and Rec. ITU-T X.681 | ISO/IEC 8824-2. A notation is also required to further constrain the values that c
34、an appear. Examples of such constraints are restricting the range of some component(s), or using a specified information object set to constrain an “ObjectClassFieldType“ component, or using the “AtNotation“ to specify a relation between components. This Recommendation | International Standard provi
35、des the notation for the general case of constraint specification. NOTE 1 For historical reasons the special case of a “subtype constraint“ is specified in Rec. ITU-T X.680 | ISO/IEC 8824-1. Constraint notation can appear (in round brackets) after any use of the syntactic construct “Type“, and the p
36、urpose of this Recommendation | International Standard is to specify the general case of what goes in the round brackets. NOTE 2 Multiple constraints (each inside its own round brackets) can be applied to the same “Type“, as the result of constraining a “Type“ is itself formally a “Type“ construct.
37、When a constraint is applied to the textually outermost use of a “Type“ construct, it results in the creation of a new type which is a subtype of the original (parent) type. A subtype of a parent type can itself be used in defining other subtypes of the same parent type in other uses of the constrai
38、nt notation. Thus the subset of values constituting a subtype can be defined either by limiting the range of the parent type, or by specifying the subtype as a union of sets of values. NOTE 3 The “ValueSet“ notation specified in Rec. ITU-T X.680 | ISO/IEC 8824-1, 16.7, provides a further means of sp
39、ecifying a subtype. Constraints may also be used to produce a subtype of a parent type (as described above) when the notation is embedded within another type. However, some “component relation“ constraints are textually included following a “Type“ (within a set or sequence type definition), but are
40、not used to restrict the set of possible values of the “Type“ which they follow (the referencing component). Rather, they specify a relation between the value of the referencing component and the value of one or more other “Type“s in the same set or sequence type (called the referenced components).
41、Component relation constraints can be seen as subtyping the sequence type within which they are embedded, but not necessarily the referencing type. A constraint on an “ObjectClassFieldType“ component can be applied by restricting the type or values in the component by using an information object set
42、. Such constraints are called table constraints, since they are specified in terms of the “associated table“ of the object set. The component relation constraints defined in this Recommendation | International Standard are a special case of table constraints. Finally, a “Type“ may be subtyped by spe
43、cifying the set of values in the subtype by human-readable text. Such a constraint is called a user-defined constraint. For example, a user-defined constraint can be specified to constrain a BIT STRING to the set of values produced by the encryption of a value of a specified ASN.1 type. It is the pu
44、rpose of this Recommendation | International Standard to provide the notation to be used for specifying table constraints (including component relation constraints), and user-defined constraints. NOTE 4 In general, full support for the specification of constraints in a flexible way (particularly com
45、ponent relation constraints, subtyping constraints, and user-defined constraints with a formally defined body) would require notation with a power comparable to that of programming languages. Such power can only be sensibly provided by the establishment of links from the ASN.1 notation into some oth
46、er defined computer language. This version of this Recommendation | International Standard does not provide such links, and hence supports only a small number of constraining mechanisms. While the embedding of notation defining constraints (subtypes and relationships) will frequently be the most con
47、venient form of specification (particularly for the simple subtyping of primitive components of structures), separate (external) specification will sometimes be preferred, particularly where the constraints are being imposed by a separate group from that which defined the basic protocol. NOTE 5 The
48、parameterization defined in Rec. ITU-T X.683 | ISO/IEC 8824-4 is specifically designed to enable a piece of ASN.1 specification (and in particular, a constraint) to be parameterized, allowing the actual constraint to be imposed by some other group that provides actual parameters for the parameterize
49、d construct. Rec. ITU-T X.682 (08/2015) v The notations for constraint specification supported here are: user-defined constraints (see clause 9); table constraints, including component relation constraints between two components which are carrying values related to an information object, defined using the notation of Rec. ITU-T X.681 | ISO/IEC 8824-2 (see clause 10); contents constraints (see clause 11). The application of table constraints to the “InstanceOfType“ construct of Rec. ITU-T X.681 |
