1、 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.683 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (08/2015) SERIES X: DATA NETWORKS, OPEN SYSTEM COMMUNICATIONS AND SECURITY OSI networking and system aspects Abstract Syntax Notation One (ASN.1) Information technology
2、Abstract Syntax Notation One (ASN.1): Parameterization of ASN.1 specifications Recommendation ITU-T X.683 ITU-T X-SERIES RECOMMENDATIONS DATA NETWORKS, OPEN SYSTEM COMMUNICATIONS AND SECURITY PUBLIC DATA NETWORKS Services and facilities X.1X.19 Interfaces X.20X.49 Transmission, signalling and switch
3、ing 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-mode protocol specifications X.220X.229 Connectionless-mode protocol specifications X.230X.239 PIC
4、S 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 Satellite data transmission systems X.350X.369 IP-based networks X.370X.379 MESSAGE HANDLING SYSTEM
5、S 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 Syntax Notation One (ASN.1) X.680X.699 OSI MANAGEMENT Systems management framework and architecture X.
6、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 Commitment, concurrency and recovery X.850X.859 Transaction processing X.860X.879 Remote operations
7、 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 X.1200X.1299 SECURE APPLICATIONS AND SERVICES X.1300X.1399 CYBERSECURITY INFORMATION EXCHANGE X.
8、1500X.1599 CLOUD COMPUTING SECURITY X.1600X.1699 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T X.683 (08/2015) i INTERNATIONAL STANDARD ISO/IEC 8824-4 RECOMMENDATION ITU-T X.683 Information technology Abstract Syntax Notation One (ASN.1): Parameterization of ASN.
9、1 specifications Summary Recommendation ITU-T X.683 | ISO/IEC 8824-4 defines the provisions for parameterized reference names and parameterized assignments for data types which are useful for the designer when writing specifications where some aspects are left undefined at certain stages of the deve
10、lopment to be filled in at a later stage to produce a complete definition of an abstract syntax. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T X.683 1994-07-01 7 11.1002/1000/3045 2.0 ITU-T X.683 1997-12-12 7 11.1002/1000/4446 2.1 ITU-T X.683 (1997) Amd. 1 1999-06-18 7 11.
11、1002/1000/4703 3.0 ITU-T X.683 2002-07-14 17 11.1002/1000/6088 3.1 ITU-T X.683 (2002) Technical Cor. 1 2007-05-29 17 11.1002/1000/9107 4.0 ITU-T X.683 2008-11-13 17 11.1002/1000/9607 4.1 ITU-T X.683 (2008) Cor. 1 2014-03-01 17 11.1002/1000/12146 5.0 ITU-T X.683 2015-08-13 17 11.1002/1000/12482 * To
12、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.683 (08/2015) FOREWORD The International Telecommunication Union (ITU) is the Un
13、ited 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 studying technical, operating and tariff questions and issuing Recomme
14、ndations 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 groups which, in turn, produce Recommendations on these topics. The ap
15、proval 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 with ISO and IEC. NOTE In this Recommendation, the expression “Administr
16、ation“ 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 provisions (to ensure, e.g., interoperability or applicability) and compli
17、ance 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 such words does not suggest that compliance with the Recommendation is
18、 required of any party. INTELLECTUAL PROPERTY RIGHTSITU 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 position concerning the evidence, validity or applicability of claimed Inte
19、llectual 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, protected by patents, which may be required to implement this Recommendation
20、. 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 of this publication may be reproduced, by any means whatsoever, without
21、the prior written permission of ITU. Rec. ITU-T X.683 (08/2015) iii CONTENTS Page Introduction . iv 1 Scope 1 2 Normative references 1 2.1 Identical Recommendations | International Standards . 1 3 Definitions 1 3.1 Specification of basic notation 1 3.2 Information object specification 1 3.3 Constrai
22、nt specification . 1 3.4 Additional definitions 1 4 Abbreviations . 2 5 Convention . 2 6 Notation 2 6.1 Assignments 2 6.2 Parameterized definitions 2 6.3 Symbols . 3 7 ASN.1 lexical items 3 8 Parameterized assignments . 3 9 Referencing parameterized definitions . 5 10 Abstract syntax parameters . 8
23、Annex A Examples . 9 A.1 Example of the use of a parameterized type definition 9 A.2 Example of use of parameterized definitions together with an information object class . 9 A.3 Example of parameterized type definition that is finite . 10 A.4 Example of a parameterized value definition 11 A.5 Examp
24、le of a parameterized value set definition . 11 A.6 Example of a parameterized class definition . 11 A.7 Example of a parameterized object set definition 12 A.8 Example of a parameterized object set definition 12 Annex B Summary of the notation 13 iv Rec. ITU-T X.683 (08/2015) Introduction Applicati
25、on designers need to write specifications in which certain aspects are left undefined. Those aspects will later be defined by one or more other groups (each in its own way), to produce a fully defined specification for use in the definition of an abstract syntax (one for each group). In some cases,
26、aspects of the specification (for example, bounds) may be left undefined even at the time of abstract syntax definition, being completed by the specification of International Standardized Profiles or functional profiles from some other body. NOTE 1 It is a requirement imposed by this Recommendation
27、| International Standard that any aspect that is not solely concerned with the application of constraints has to be completed prior to the definition of an abstract syntax. In the extreme case, some aspects of the specification may be left for the implementer to complete, and would then be specified
28、 as part of the Protocol Implementation Conformance Statement. While the provisions of Rec. ITU-T X.681 | ISO/IEC 8824-2 and Rec. ITU-T X.682 | ISO/IEC 8824-3 provide a framework for the later completion of parts of a specification, they do not of themselves solve the above requirements. Additionall
29、y, a single designer sometimes requires to define many types, or many information object classes, or many information object sets, or many information objects, or many values, which have the same outer level structure, but differ in the types, or information object classes, or information object set
30、s, or information objects, or values, that are used at an inner level. Instead of writing out the outer level structure for every such occurrence, it is useful to be able to write it out once, with parts left to be defined later, then to refer to it and provide the additional information. All these
31、requirements are met by the provision for parameterized reference names and parameterized assignments by this Recommendation | International Standard. The syntactic form of a parameterized reference name is the same as that of the corresponding normal reference name, but the following additional con
32、siderations apply: When it is assigned in a parameterized assignment statement, it is followed by a list of dummy reference names in braces, each possibly accompanied by a governor; these reference names have a scope which is the right-hand side of the assignment statement, and the parameter list it
33、self. NOTE 2 This is what causes it to be recognized as a parameterized reference name. When it is exported or imported, it is followed by a pair of empty braces to distinguish it as a parameterized reference name. When it is used in any construct, it is followed by a list of syntactic constructions
34、, one for each dummy reference name, that provide an assignment to the dummy reference name for the purposes of that use only. Dummy reference names have the same syntactic form as the corresponding normal reference name, and can be used anywhere on the right-hand side of the assignment statement th
35、at the corresponding normal reference name could be used. All such usages are required to be consistent. ISO/IEC 8824-4 : 2005 (E) Rec. ITU-T X.683 (08/2015) 1 INTERNATIONAL STANDARD ITU-T RECOMMENDATION Information technology Abstract Syntax Notation One (ASN.1): Parameterization of ASN.1 specifica
36、tions 1 Scope This Recommendation | International Standard is part of Abstract Syntax Notation One (ASN.1) and defines notation for parameterization of ASN.1 specifications. 2 Normative references The following Recommendations and International Standards contain provisions which, through reference i
37、n this text, constitute provisions of this Recommendation | International Standard. At the time of publication, the editions indicated were valid. All Recommendations and Standards are subject to revision, and parties to agreements based on this Recommendation | International Standard are encouraged
38、 to investigate the possibility of applying the most recent edition of the Recommendations and Standards listed below. Members of IEC and ISO maintain registers of currently valid International Standards. The Telecommunication Standardization Bureau of the ITU maintains a list of currently valid ITU
39、-T Recommendations. 2.1 Identical Recommendations | International Standards Recommendation ITU-T X.680 (2015) | ISO/IEC 8824-1:2015, Information technology Abstract Syntax Notation One (ASN.1): Specification of basic notation. Recommendation ITU-T X.681 (2015) | ISO/IEC 8824-2:2015, Information tech
40、nology Abstract Syntax Notation One (ASN.1): Information object specification. Recommendation ITU-T X.682 (2015) | ISO/IEC 8824-3:2015, Information technology Abstract Syntax Notation One (ASN.1): Constraint specification. 3 Definitions For the purposes of this Recommendation | International Standar
41、d, the following definitions apply. 3.1 Specification of basic notation This Recommendation | International Standard uses the terms defined in Rec. ITU-T X.680 | ISO/IEC 8824-1. 3.2 Information object specification This Recommendation | International Standard uses the terms defined in Rec. ITU-T X.6
42、81 | ISO/IEC 8824-2. 3.3 Constraint specification This Recommendation | International Standard uses the terms defined in Rec. ITU-T X.682 | ISO/IEC 8824-3. 3.4 Additional definitions 3.4.1 normal reference name: A reference name defined, without parameters, by means of an “Assignment“ other than a “
43、ParameterizedAssignment“. Such a name references a complete definition and is not supplied with actual parameters when used. 3.4.2 parameterized reference name: A reference name defined using a parameterized assignment, which references an incomplete definition and which, therefore, must be supplied
44、 with actual parameters when used. ISO/IEC 8824-4 : 2005 (E) 2 Rec. ITU-T X.683 (08/2015) 3.4.3 parameterized type: A type defined using a parameterized type assignment and thus whose components are incomplete definitions which must be supplied with actual parameters when the type is used. 3.4.4 par
45、ameterized value: A value defined using a parameterized value assignment and thus whose value is incompletely specified and must be supplied with actual parameters when used. 3.4.5 parameterized value set: A value set defined using a parameterized value set assignment and thus whose values are incom
46、pletely specified and must be supplied with actual parameters when used. 3.4.6 parameterized object class: An information object class defined using a parameterized object class assignment and thus whose field specifications are incompletely specified and must be supplied with actual parameters when
47、 used. 3.4.7 parameterized object: An information object defined using a parameterized object assignment and thus whose components are incompletely specified and must be supplied with actual parameters when used. 3.4.8 parameterized object set: An information object set defined using a parameterized
48、 object set assignment and thus whose objects are incompletely specified and must be supplied with actual parameters when used. 3.4.9 variable constraint: A constraint employed in specifying a parameterized abstract syntax, and which depends on some parameter of the abstract syntax. 4 Abbreviations
49、For the purposes of this Recommendation | International Standard, the following abbreviation applies: ASN.1 Abstract Syntax Notation One 5 Convention This Recommendation | International Standard employs the notational convention defined in Rec. ITU-T X.680 | ISO/IEC 8824-1, clause 5. 6 Notation This clause summarizes the notation defined in this Recommendation | International Standard. 6.1 Assignments The following notation which can be used as an alternative for “Assignment“ (see Rec. ITU-T X.680
