1、 Reference numberISO/IEC 8824-3:2002(E)ISO/IEC 2002INTERNATIONAL STANDARD ISO/IEC8824-3Third edition2002-12-15Information technology Abstract Syntax Notation One (ASN.1): Constraint specification Technologies de linformation Notation de syntaxe abstraite numro un (ASN.1): Spcification des contrainte
2、s Adopted by INCITS (InterNational Committee for Information Technology Standards) as an American National Standard.Date of ANSI Approval: 12/28/2004Published by American National Standards Institute,25 West 43rd Street, New York, New York 10036Copyright 2004 by Information Technology Industry Counc
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10、 47 E-mail copyrightiso.org Web www.iso.org Published by ISO in 2003 Published in Switzerland ii ISO/IEC 2002 All rights reservedCopyright American National Standards Institute Provided by IHS under license with ANSI Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-
11、ISO/IEC 8824-3:2002(E) ISO/IEC 2002 All rights reserved iiiCONTENTS Page Introduction . v 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 Parameterization o
12、f 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 lexical items 2 7.1 Additional keyword items . 2 8 General constraint specification . 3 9 User-defined constraints. 3 10 Table constraints, including component relation con
13、straints 4 11 Contents Constraints. 7 Annex A Constraining instance-of types 8 Annex B Summary of the notation 9 Copyright American National Standards Institute Provided by IHS under license with ANSI Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ISO/IEC 8824-3:2
14、002(E) iv ISO/IEC 2002 All rights reservedForeword 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
15、 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, i
16、n 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 join
17、t 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. Attenti
18、on 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. ISO/IEC 8824-3 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subc
19、ommittee SC 6, Telecommunications and information exchange between systems, in collaboration with ITU-T. The identical text is published as ITU-T Rec. X.682. This third edition cancels and replaces the second edition (ISO/IEC 8824-3:1998), which has been technically revised. It also incorporates the
20、 Technical Corrigenda ISO/IEC 8824-3:1998/Cor.1:2001, ISO/IEC 8824-3:1998/Cor.2:2002 and ISO/IEC 8824-3:1998/Cor.3:2002. ISO/IEC 8824 consists of the following parts, under the general title Information technology Abstract Syntax Notation One (ASN.1): Part 1: Specification of basic notation Part 2:
21、Information object specification Part 3: Constraint specification Part 4: Parameterization of ASN.1 specifications Copyright American National Standards Institute Provided by IHS under license with ANSI Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ISO/IEC 8824-3
22、:2002(E) ISO/IEC 2002 All rights reserved vIntroduction Application designers require a notation to define a structured data type to convey their semantics. This is provided in ITU-T Rec. X.680 | ISO/IEC 8824-1 and ITU-T Rec. X.681 | ISO/IEC 8824-2. A notation is also required to further constrain t
23、he values that can 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 | Internationa
24、l Standard provides the notation for the general case of constraint specification. NOTE 1 For historical reasons the special case of a “subtype constraint“ is specified in ITU-T Rec. X.680 | ISO/IEC 8824-1. Constraint notation can appear (in round brackets) after any use of the syntactic construct “
25、Type“, and the purpose 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 “T
26、ype“ construct. 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
27、 of the constraint 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 ITU-T Rec. X.680 | ISO/IEC 8824-1, 15.7, provides a fur
28、ther means of specifying 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 defin
29、ition), but are 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 referenc
30、ed components). 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 inform
31、ation object set. 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
32、 subtyped by specifying 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 ty
33、pe. It is the purpose 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 (
34、particularly component 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 notati
35、on into some other 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
36、 be the most convenient 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 proto
37、col. NOTE 5 The parameterization defined in ITU-T Rec. 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
38、the parameterized construct. 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 notati
39、on of ITU-T Rec. X.681 | ISO/IEC 8824-2 (see clause 10); contents constraints (see clause 11). The application of table constraints to the “InstanceOfType“ construct of ITU-T Rec. X.681 | ISO/IEC 8824-2, Annex C, is specified in Annex A. Copyright American National Standards Institute Provided by IH
40、S under license with ANSI Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-Copyright American National Standards Institute Provided by IHS under license with ANSI Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ISO/IEC 8824-3:2003
41、(E) ITU-T Rec. X.682 (07/2002) 1 INTERNATIONAL STANDARD ISO/IEC 8824-3 : 2002 (E) ITU-T Rec. X.682 (2002 E) ITU-T RECOMMENDATION Information technology Abstract Syntax Notation One (ASN.1): Constraint specification 1 Scope This Recommendation | International Standard is part of Abstract Syntax Notat
42、ion One (ASN.1) and provides notation for specifying user-defined constraints, table constraints, and contents constraints. 2 Normative references The following Recommendations and International Standards contain provisions which, through reference in this text, constitute provisions of this Recomme
43、ndation | 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 to investigate the possibility of applying the mo
44、st 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-T Recommendations. 2.1 Identical Recommendations
45、| International Standards ITU-T Recommendation X.680 (2002) | ISO/IEC 8824-1:2002, Information technology Abstract Syntax Notation One (ASN.1): Specification of basic notation. ITU-T Recommendation X.681 (2002) | ISO/IEC 8824-2:2002, Information technology Abstract Syntax Notation One (ASN.1): Infor
46、mation object specification. ITU-T Recommendation X.683 (2002) | ISO/IEC 8824-4:2002, Information technology Abstract Syntax Notation One (ASN.1): Parameterization of ASN.1 specifications. 3 Definitions For the purposes of this Recommendation | International Standard, the following definitions apply
47、. 3.1 Specification of basic notation This Recommendation | International Standard uses the terms defined in ITU-T Rec. X.680 | ISO/IEC 8824-1. 3.2 Information object specification This Recommendation | International Standard uses the terms defined in ITU-T Rec. X.681 | ISO/IEC 8824-2. 3.3 Parameter
48、ization of ASN.1 specification This Recommendation | International Standard uses the following term defined in ITU-T Rec. X.683 | ISO/IEC 8824-4: parameterized type. 3.4 Additional definitions 3.4.1 component relation constraint: A constraint on the values of a set type or sequence type which is tex
49、tually associated with one of the component types (the referencing component) of the set type or sequence type, and which ISO/IEC 8824-1:2002 (E)ISO/IEC 8824-3:2002 (E)Copyright American National Standards Institute Provided by IHS under license with ANSI Not for ResaleNo reproduction or networking permitted without license from IHS-,
