ASN.1参数化规范：国际电信联盟X.683标准解析

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"X.683-Abstract Syntax Notation One (ASN.1): Parameterization of ASN.1 specifications" 本文档，ITU-T X.683，是国际电信联盟（ITU-T）和国际标准化组织（ISO）/国际电工委员会（IEC）联合发布的关于ASN.1（抽象语法标记一）的标准规范，特别是关于ASN.1规范的参数化。ASN.1是一种通用的数据表示语言，广泛应用于通信协议、数据存储和软件接口的定义，因为它能提供一种标准化的方式来描述复杂的结构化数据。 ASN.1的核心概念包括以下几个方面： 1. **基本类型**：ASN.1定义了一系列基本数据类型，如整数、浮点数、字符串、位串、对象标识符等，这些类型可以满足各种复杂数据结构的需求。 2. **构造类型**：除了基本类型，ASN.1还提供了构造类型，如SET和SEQUENCE，它们允许创建包含多个组件的数据结构，每个组件可以是基本类型或另一个构造类型。 3. **模版参数化**：X.683特别关注的点是ASN.1规范的参数化，这意味着你可以定义一个通用的asn.1模块，然后通过传递不同的参数来实例化出具体的模块。这在定义复杂系统中的一组相似但不完全相同的协议元素时非常有用。 4. **编码规则**：ASN.1定义了多种编码规则，如BER（Basic Encoding Rules）、DER（Distinguished Encoding Rules）和PER（Packed Encoding Rules）。BER是默认编码规则，相对灵活但效率较低；DER是BER的一个子集，用于确保编码的唯一性，常用于X.509证书；PER则是一种更高效的编码方式，适合有限带宽的环境。 5. **PICS proforma**：PICS（Protocol Implementation Conformance Statement）是描述协议实现符合性声明的一种形式，而PICS proforma是它的模板，用于定义如何编写和比较不同实现的符合性声明。X.683中可能包含了关于如何参数化PICS声明的指导。 6. **应用领域**：ASN.1被广泛应用在诸如网络通信、操作系统交互、公共数据网络服务和设施、接口、传输、信号处理、网络管理、安全协议等领域，涉及到X系列推荐中的多个部分，例如X.200至X.299，用于开放系统互连模型和符号的定义。通过遵循X.683标准，开发者和工程师可以更有效地创建和维护跨平台、跨系统的通信协议，确保数据的准确无误传输，并简化了不同系统之间的互操作性。理解并掌握ASN.1及其参数化对于那些设计和实现复杂通信系统的专业人员来说至关重要。

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 Constraint 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

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 Example 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

ITU-T Rec. X.683 (07/2002) iii

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ASN.1参数化规范：国际电信联盟X.683标准解析

X.682-Abstract Syntax Notation One (ASN.1): Constraint specification

asn.1(Abstract Syntax Notation One)

X.690-ASN.1 encoding rules; Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) 和 Distinguished Encoding Rules (DER)

ASN.1（Abstract Syntax Notation One）标准的语法格式

var element = document.querySelectorAll("#app > div > div.main-container > section > div > div.flex-row.mt-2 > div > div.el-select.mr-1.statusStyle.mt-1.select-style > div.el-input.el-input--suffix > input")) 报错：Uncaught SyntaxError: Unexpected token ')'

定义ASN.1模块的开始和结束分别是什么

python args.py --image_path "D:\Python Data pack\girl.png.png" ^^^^ SyntaxError: invalid syntax

python args.py --image_path "D:/Python Data pack/girl.png.png" ^^^^ SyntaxError: invalid syntax

1: kd> .logopen Closing open log file dbgeng.log Opened log file 'dbgeng.log' 1: kd> .logmask -a ^ Syntax error in '.logmask -a' 1: kd> .logclose Closing open log file dbgeng.log

1: kd> .logclose Closing open log file dbgeng.log 1: kd> .logopen Opened log file 'dbgeng.log' 1: kd> .logmask -i ^ Syntax error in '.logmask -i' 1: kd> .logclose Closing open log file dbgeng.log

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