Information technology — Abstract Syntax Notation One (ASN.1): Specification of basic notation — Part 1:

ISO/IEC 8824-1:2015 provides a standard notation called Abstract Syntax Notation One (ASN.1) that is used for the definition of data types, values, and constraints on data types. ISO/IEC 8824-1:2015: - defines a number of simple types, with their tags, and specifies a notation for referencing these types and for specifying values of these types; - defines mechanisms for constructing new types from more basic types, and specifies a notation for defining such types and assigning them tags, and for specifying values of these types; - defines character sets (by reference to other Recommendations and/or International Standards) for use within ASN.1. The ASN.1 notation can be applied whenever it is necessary to define the abstract syntax of information. The ASN.1 notation is referenced by other standards which define encoding rules for the ASN.1 types.

Technologies de l'information — Notation de syntaxe abstraite numéro un (ASN.1): Spécification de la notation de base — Partie 1:

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Status
Withdrawn
Publication Date
11-Nov-2015
Current Stage
9092 - International Standard to be revised
Start Date
02-Jul-2020
Completion Date
02-Jul-2020
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INTERNATIONAL ISO/IEC
STANDARD 8824-1
Fifth edition
2015-11-15
Information technology -- Abstract Syntax
Notation One (ASN.1): Specification of
basic notation
Technologies de l'information — Notation de syntaxe abstraite numéro
un (ASN.1): Spécification de la notation de base
Reference number
ISO/IEC 8824-1:2015(E)
ISO/IEC 2015
---------------------- Page: 1 ----------------------
ISO/IEC 8824-1:2015(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 or an intranet, without prior written permission.

Permission can be requested from either ISO at the address below or ISO’s member body in the country of the requester.

ISO copyright office
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Published in Switzerland
ii © ISO/IEC 2015 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/IEC 8824-1:2015(E)
Foreword

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 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 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 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 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 cancels and replaces the fourth edition of ISO/IEC 8824-1:2008 which has been technically

revised. It also incorporates ISO/IEC 8824-1:2008/Cor.1:2012 and ISO/IEC 8824-5:2008.Cor.2:2014.

ISO/IEC 8824-1 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,

Subcommittee SC 6, Telecommunications and information exchange between systems, in collaboration with

ITU-T. The identical text is published as ITU-T X.680 (08/2015).
© ISO/IEC 2015 – All rights reserved iii
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Int e rnat ional Telecommunicat ion U n ion
ITU-T X.680
(08/2015)
TELECOMMUNICATION
STANDARDIZATION SECTOR
OF ITU
SERIES X: DATA NETWORKS, OPEN SYSTEM
COMMUNICATIONS AND SECURITY
OSI networking and system aspects – Abstract Syntax
Notation One (ASN.1)
Information technology – Abstract Syntax
Notation One (ASN.1): Specification of basic
notation
Recommendation ITU-T X.680
---------------------- Page: 4 ----------------------
ITU-T X-SERIES RECOMMENDATIONS
DATA NETWORKS, OPEN SYSTEM COMMUNICATIONS AND SECURITY
PUBLIC DATA NETWORKS
Services and facilities X.1–X.19
Interfaces X.20–X.49
Transmission, signalling and switching X.50–X.89
Network aspects X.90–X.149
Maintenance X.150–X.179
Administrative arrangements X.180–X.199
OPEN SYSTEMS INTERCONNECTION
Model and notation X.200–X.209
Service definitions X.210–X.219
Connection-mode protocol specifications X.220–X.229
Connectionless-mode protocol specifications X.230–X.239
PICS proformas X.240–X.259
Protocol Identification X.260–X.269
Security Protocols X.270–X.279
Layer Managed Objects X.280–X.289
Conformance testing X.290–X.299
INTERWORKING BETWEEN NETWORKS
General X.300–X.349
Satellite data transmission systems X.350–X.369
IP-based networks X.370–X.379
MESSAGE HANDLING SYSTEMS X.400–X.499
DIRECTORY X.500–X.599
OSI NETWORKING AND SYSTEM ASPECTS
Networking X.600–X.629
Efficiency X.630–X.639
Quality of service X.640–X.649
Naming, Addressing and Registration X.650–X.679
Abstract Syntax Notation One (ASN.1) X.680–X.699
OSI MANAGEMENT
Systems management framework and architecture X.700–X.709
Management communication service and protocol X.710–X.719
Structure of management information X.720–X.729
Management functions and ODMA functions X.730–X.799
SECURITY X.800–X.849
OSI APPLICATIONS
Commitment, concurrency and recovery X.850–X.859
Transaction processing X.860–X.879
Remote operations X.880–X.889
Generic applications of ASN.1 X.890–X.899
OPEN DISTRIBUTED PROCESSING X.900–X.999
INFORMATION AND NETWORK SECURITY X.1000–X.1099
SECURE APPLICATIONS AND SERVICES X.1100–X.1199
CYBERSPACE SECURITY X.1200–X.1299
SECURE APPLICATIONS AND SERVICES X.1300–X.1399
CYBERSECURITY INFORMATION EXCHANGE X.1500–X.1599
CLOUD COMPUTING SECURITY X.1600–X.1699
For further details, please refer to the list of ITU-T Recommendations.
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO/IEC 8824-1
RECOMMENDATION ITU-T X.680
Information technology – Abstract Syntax Notation One (ASN.1):
Specification of basic notation
Summary

Recommendation ITU-T X.680 | ISO/IEC 8824-1 provides a notation called Abstract Syntax Notation One (ASN.1) for

defining the syntax of information data. It defines a number of simple data types and specifies a notation for referencing

these types and for specifying values of these types.

The ASN.1 notations can be applied whenever it is necessary to define the abstract syntax of information without

constraining in any way how the information is encoded for transmission.
History
Edition Recommendation Approval Study Group Unique ID
1.0 ITU-T X.680 1994-07-01 7 11.1002/1000/3040
1.1 ITU-T X.680 (1994) Amd. 1 1995-04-10 7 11.1002/1000/3041
1.2 ITU-T X.680 (1994) Technical Cor. 1 1995-11-21 7 11.1002/1000/3282
1.3 ITU-T X.680 (1994) Technical Cor. 2 1997-12-12 7 11.1002/1000/4180
1.4 ITU-T X.680 (1994) Amd. 1/Technical Cor.1 1997-12-12 7 11.1002/1000/4179
1.5 ITU-T X.680 (1994) Amd. 2 1997-12-12 7 11.1002/1000/4181
2.0 ITU-T X.680 1997-12-12 7 11.1002/1000/4449
2.1 ITU-T X.680 (1997) Technical Cor. 1 1999-06-18 7 11.1002/1000/4700
2.2 ITU-T X.680 (1997) Amd. 1 1999-06-18 7 11.1002/1000/4698
2.3 ITU-T X.680 (1997) Amd. 2 1999-06-18 7 11.1002/1000/4699
2.4 ITU-T X.680 (1997) Technical Cor. 2 2000-03-31 7 11.1002/1000/5046
2.5 ITU-T X.680 (1997) Technical Cor. 3 2001-02-02 7 11.1002/1000/5331
2.6 ITU-T X.680 (1997) Technical Cor. 4 2001-03-15 7 11.1002/1000/5332
2.7 ITU-T X.680 (1997) Amd. 3 2001-10-29 7 11.1002/1000/5562
2.8 ITU-T X.680 (1997) Amd. 4 2001-10-29 7 11.1002/1000/5563
3.0 ITU-T X.680 2002-07-14 17 11.1002/1000/6085
3.1 ITU-T X.680 (2002) Amd. 1 2003-10-29 17 11.1002/1000/7019
3.2 ITU-T X.680 (2002) Amd. 2 2004-08-29 17 11.1002/1000/7291
3.3 ITU-T X.680 (2002) Technical Cor. 1 2005-05-14 17 11.1002/1000/8512
3.4 ITU-T X.680 (2002) Amd. 3 2006-06-13 17 11.1002/1000/8836
3.5 ITU-T X.680 (2002) Amd. 4 2007-05-29 17 11.1002/1000/9105
4.0 ITU-T X.680 2008-11-13 17 11.1002/1000/9604
4.1 ITU-T X.680 (2008) Cor. 1 2011-10-14 17 11.1002/1000/11376
4.2 ITU-T X.680 (2008) Cor. 2 2014-03-01 17 11.1002/1000/12144
5.0 ITU-T X.680 2015-08-13 17 11.1002/1000/12479

To access the Recommendation, type the URL http://handle.itu.int/ in the address field of your web browser, followed by the

Recommendation's unique ID. For example, http://handle.itu.int/11.1002/1000/11830-en.

Rec. ITU-T X.680 (08/2015) i
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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 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 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-T's 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 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 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 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 position 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,

protected 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 of this publication may be reproduced, by any means whatsoever, without the

prior written permission of ITU.
ii Rec. ITU-T X.680 (08/2015)
---------------------- Page: 7 ----------------------
CONTENTS
Page

Introduction ............................................................................................................................................................... viii

1 Scope .............................................................................................................................................................. 1

2 Normative references ...................................................................................................................................... 1

2.1 Identical Recommendations | International Standards ......................................................................... 1

2.2 Additional references .......................................................................................................................... 2

3 Definitions ...................................................................................................................................................... 2

3.1 International Object Identifier tree specification ................................................................................. 2

3.2 Information object specification .......................................................................................................... 2

3.3 Constraint specification ....................................................................................................................... 3

3.4 Parameterization of ASN.1 specification ............................................................................................ 3

3.5 Structure for identification of organizations ........................................................................................ 3

3.6 Universal Multiple-Octet Coded Character Set (UCS)........................................................................ 3

3.7 Representation of dates and times ....................................................................................................... 3

3.8 Additional definitions .......................................................................................................................... 4

4 Abbreviations ................................................................................................................................................. 9

5 Notation .......................................................................................................................................................... 9

5.1 General ................................................................................................................................................ 9

5.2 Productions.......................................................................................................................................... 10

5.3 The alternative collections .................................................................................................................. 10

5.4 Non-spacing indicator ......................................................................................................................... 10

5.5 Example of a production ..................................................................................................................... 10

5.6 Layout ................................................................................................................................................. 11

5.7 Recursion ............................................................................................................................................ 11

5.8 References to permitted sequences of lexical items ............................................................................ 11

5.9 References to a lexical item ................................................................................................................. 11

5.10 Short-hand notations ........................................................................................................................... 11

5.11 Value references and the typing of values ........................................................................................... 12

6 The ASN.1 model of type extension ............................................................................................................... 12

7 Extensibility requirements on encoding rules ................................................................................................. 12

8 Tags ................................................................................................................................................................ 13

9 Encoding instructions ..................................................................................................................................... 14

10 Use of the ASN.1 notation .............................................................................................................................. 14

11 The ASN.1 character set ................................................................................................................................. 15

12 ASN.1 lexical items ........................................................................................................................................ 16

12.1 General rules ....................................................................................................................................... 16

12.2 Type references ................................................................................................................................... 17

12.3 Identifiers ............................................................................................................................................ 17

12.4 Value references .................................................................................................................................. 17

12.5 Module references ............................................................................................................................... 17

12.6 Comments............................................................................................................................................ 17

12.7 Empty lexical item ............................................................................................................................... 18

12.8 Numbers .............................................................................................................................................. 18

12.9 Real numbers ....................................................................................................................................... 18

12.10 Binary strings ...................................................................................................................................... 18

12.11 XML binary string item ....................................................................................................................... 18

12.12 Hexadecimal strings ............................................................................................................................ 18

12.13 XML hexadecimal string item ............................................................................................................. 19

12.14 Character strings .................................................................................................................................. 19

12.15 XML character string item .................................................................................................................. 20

Rec. ITU-T X.680 (08/2015) iii
---------------------- Page: 8 ----------------------

12.16 The simple character string lexical item .............................................................................................. 22

12.17 Time value character strings ................................................................................................................ 22

12.18 XML time value character string item ................................................................................................. 22

12.19 The property and setting names lexical item ....................................................................................... 22

12.20 Assignment lexical item ...................................................................................................................... 22

12.21 Range separator ................................................................................................................................... 22

12.22 Ellipsis ................................................................................................................................................. 22

12.23 Left version brackets ........................................................................................................................... 23

12.24 Right version brackets ......................................................................................................................... 23

12.25 Encoding references ............................................................................................................................ 23

12.26 Integer-valued Unicode labels ............................................................................................................. 23

12.27 Non-integer Unicode labels ................................................................................................................. 23

12.28 XML end tag start item ....................................................................................................................... 23

12.29 XML single tag end item ..................................................................................................................... 23

12.30 XML boolean true item ....................................................................................................................... 23

12.31 XML boolean extended-true item ....................................................................................................... 24

12.32 XML boolean false item ...................................................................................................................... 24

12.33 XML boolean extended-false item ...................................................................................................... 24

12.34 XML real not-a-number item .............................................................................................................. 24

12.35 XML real infinity item ........................................................................................................................ 24

12.36 XML tag names for ASN.1 types ........................................................................................................ 25

12.37 Single character lexical items .............................................................................................................. 26

12.38 Reserved words ................................................................................................................................... 26

13 Module definition ........................................................................................................................................... 27

14 Referencing type and value definitions ........................................................................................................... 31

15 Notation to support references to ASN.1 components .................................................................................... 32

16 Assigning types and values ............................................................................................................................. 33

17 Definition of types and values ........................................................................................................................ 35

18 Notation for the boolean type ......................................................................................................................... 38

19 Notation for the integer type ........................................................................................................................... 38

20 Notation for the enumerated type ................................................................................................................... 39

21 Notation for the real type ................................................................................................................................ 41

22 Notation for the bitstring type ......................................................................................................................... 42

23 Notation for the octetstring type ..................................................................................................................... 44

24 Notation for the null type ................................................................................................................................ 45

25 Notation for sequence types............................................................................................................................ 45

26 Notation for sequence-of types ....................................................................................................................... 48

27 Notation for set types ...................................................................................................................................... 51

28 Notation for set-of types ................................................................................................................................. 52

29 Notation for choice types ................................................................................................................................ 52

30 Notation for selection types ............................................................................................................................ 54

31 Notation for prefixed types ............................................................................................................................. 55

31.1 General ................................................................................................................................................ 55

31.2 The tagged type ................................................................................................................................... 55

31.3 The encoding prefixed type ................................................................................................................. 56

32 Notation for the object identifier type ............................................................................................................ 57

33 Notation for the relative object identifier type ................................................................................................ 58

34 Notation for the OID internationalized resource identifier type ..................................................................... 60

35 Notation for the relative OID internationalized resource identifier type ........................................................ 60

36 Notation for the embedded-pdv type .............................................................................................................. 61

iv Rec. ITU-T X.680 (08/2015)
---------------------- Page: 9 ----------------------

37 Notation for the external type ......................................................................................................................... 63

38 The time type .................................................................................................................................................. 64

38.1 General ................................................................................................................................................ 64

38.2 Time properties and settings of time abstract values ........................................................................... 64

38.3 Basic value notation and XML value notation for time abstract values with specified property

settings ................................................................................................................................................ 68

38.4 Useful time types ................................................................................................................................. 72

39 The character string types ............................................................................................................................... 74

40 Notation for character string types.................................................................................................................. 74

41 Definition of restricted character string types ................................................................................................. 75

42 Naming characters, collections and property category sets ............................................................................ 79

43 Canonical order of characters ......................................................................................................................... 82

44 Definition of unrestricted character string types ............................................................................................. 83

45 Notation for types defined in clauses 46 to 48 ................................................................................................ 84

46 Generalized time ............................................................................................................................................. 84

47 Universal time ................................................................................................................................................ 86

48 The object descriptor type .............................................................................................................................. 87

49 Constrained types ........................................................................................................................................... 87

50 Element set specification ................................................................................................................................ 88

51 Subtype elements ............................................................................................................................................ 90

51.1 General ................................................................................................................................................ 90

51.2 Single value ......................................................................................................................................... 92

51.3 Contained subtype ........
...

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