计算机英语经典短文：CMS
CMS i ued to digitally ign or encrypt arbitrary meage. CMS decribe an encapulation yntax for data protection. It upport digital ignature and Encryption. The yntax allow multiple encapulation, o one encapulation envelope can be neted inide another. Likewie, one party can digitally ign ome previouly encapulated data. It alo allow arbitrary attribute, uch a igning time, to be authenticated along with the meage content, and provide for other attribute uch a counter-ignature to be aociated with a ignature.
CMS被用于数据签名或者任意消息加密中。CMS提供了一套用于数据保护的数据封装语法。该语法支持数据签名和数据加密。该语法允许多重封装，所以一封数据信封能被另外一封数据信封所封装。同样的，该语法封装数据的部分数据位可以用来表示被封装数据。也允附加一些属性如签名时间，它和内容信息一起用于鉴别信息;计数器属性，它为其它属性提供计数信息。
计算机英语经典短文：XDM
XDM i the foundation of XPath 2.0 and define the Data Model for XPath 2.0 (and conequently XQuery 1.0 and XSLT 2.0, which are both baed on XPath 2.0). XDM i built on top of the XML Info et (the abtraction of an XML document), PSVI (type annotation in the XML Info et a the reult of XML Schema validation), the imple data type of XML Schema, and additional concept. The mot important additional concept i that of a "equence", which embrace both imple data type and the XML-derived node.WWw.hAOZuowEn.com
XDM是XPath2.0的基础，它定义了XPath2.0的数据模型(因此XQuery 1.0 、XSLT 2.0也就基于XPath 2.0)。XDM 建立在XML信息集(从XML文档中抽取)和PSVI(作为确认XML Schema结果的XML信息集合的注释类型)的顶端、属于简单的XML Schema的数据类型、是一个附加的概念。其中，它最重要的附加概念就是“顺序”，即包括简单数据类型和XML的源节点。
计算机英语经典短文：ABNF
Internet technical pecification often need to define a format yntax and are free to employ whatever notation their author deem ueful. Over the year, a modified verion of BNF, called ABNF, ha been popular among many Internet pecification. It balance compactne and implicity with reaonable repreentational power.
互联网技术规范经常需要定义一种格式化语法并能自由地使用作者认为是有用的任何符号。多年来，巴克斯范式（BNF）的一个修订版，即扩展巴克斯范式（ABNF），已经在许多互联网规范中流行。该版本平衡了压缩性和简单性，具有合理的表达能力。
计算机英语经典短文：X.500
X.500 i an open, ditributed, online directory ervice which i intended to be global in cope. X.500 i a upport ervice for data exchange which include providing directory upport for data communication ervice pecified by other OSI application tandard. The X.500 erie of tandard cover ervice available to uer, the functional model and protocol connecting the component part of the directory, an information framework and a chema of the information held by the directory, and a mechanim for allowing OSI component to authenticate each other.X.500是一个开放的、分布式的、趋向于全球化的在线目录服务。X.500支持数据交换服务，该服务符合OSI模型和其他应用协议下的数据传送的目录服务。X.500这一系列标准涵盖了可用的用户服务、连接各组成部分的功能和协议模型、目录的消息框架和信息保持、OSI模型中各组成部分彼此授权的支持等多个方面。