标准摘要
[中文适用范围]： 指定了一系列基本 XML 编码规则 (BASIC-XER)，可用于导出 ASN.1 类型值的传输语法；还指定了可生成唯一编码的规范 XML 编码规则 (CXER)；进一步扩展了 XML 编码规则 (EXTENDED-XER)，增加了编码选项，并允许 ASN.1 规格化器调整由 BASIC-XER 产生的编码。这些编码规则隐含用于解码；用于通信时；选择编码规则主要关注显示值和/或使用常用 XML 工具处理它们的情况；允许通过增加所有形式的可扩展性来扩展抽象语法。 [外文原描述]： This document specifies a set of basic XML Encoding Rules (BASIC-XER) that may be used to derive a transfer syntax for values of types defined in Rec. ITU-T X.680 | ISO/IEC 8824-1 and Rec. ITU-T X.681 | ISO/IEC 8824-2. This document also specifies a set of Canonical XML Encoding Rules (CXER) which provide constraints on the basic XML Encoding Rules and produce a unique encoding for any given ASN.1 value. This document further specifies a set of extended XML Encoding Rules (EXTENDED-XER) which adds further encoders options, and also allows the ASN.1 specifier to vary the encoding that would be produced by BASIC-XER. It is implicit in the specification of these encoding rules that they are also used for decoding. The encoding rules specified in this document : – are used at the time of communication; – are intended for use in circumstances where displaying of values and/or processing them using commonly available XML tools (such as browsers) is the major concern in the choice of encoding rules; – allow the extension of an abstract syntax by addition of extra values for all forms of extensibility described in Rec. ITU-T X.680 | ISO/IEC 8824‑1. This document also specifies the syntax and semantics of XER encoding instructions, and the rules for their assignment and combination. XER encoding instructions can be used to control the EXTENDED-XER encoding for specific ASN.1 types.
英文名称Information technology - ASN.1 encoding rules - Part 4: XML Encoding Rules (XER)