标准编号：ISO/IEC 8825-4:2015
中文名称：信息技术 ASN.1编码规则 第4部分：XML编码规则（XER）
英文名称：Information technology — ASN.1 encoding rules: XML Encoding Rules (XER) — Part 4:
发布日期：2015-11
标准范围
This Recommendation | International Standard specifies a set of basic XML Encoding Rules (BASIC-XER) that may beused 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 Recommendation | International Standard 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 givenASN.1 value. This Recommendation | International Standard 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 thatwould be produced by BASIC-XER. It is implicit in the specification of these encoding rules that they are also used fordecoding.The encoding rules specified in this Recommendation | International Standard:– are used at the time of communication;– are intended for use in circumstances where displaying of values and/or processing them using commonlyavailable 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 describedin Rec. ITU-T X.680 | ISO/IEC 8824-1.This Recommendation | International Standard also specifies the syntax and semantics of XER encoding instructions, andthe rules for their assignment and combination. XER encoding instructions can be used to control the EXTENDED-XERencoding for specific ASN.1 types.
标准预览图
立即下载标准文件