计算机的英语作文赏析

　　计算机英语经典短文：CMS

计算机的英语作文赏析

　　CMS is used to digitally sign or encrypt arbitrary messages. CMS describes an encapsulation syntax for data protection. It supports digital signatures and Encryption. The syntax allows multiple encapsulation, so one encapsulation envelope can be nested inside another. Likewise, one party can digitally sign some previously encapsulated data. It also allows arbitrary attributes, such as signing time, to be authenticated along with the message content, and provides for other attributes such as counter-signatures to be associated with a signature.

　　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 is the foundation of XPath 2.0 and defines the Data Model for XPath 2.0 (and consequently XQuery 1.0 and XSLT 2.0, which are both based on XPath 2.0). XDM is built on top of the XML Info set (the abstraction of an XML document), PSVI (type annotations in the XML Info set as the result of XML Schema validation), the simple data types of XML Schema, and additional concepts. The most important additional concept is that of a "sequence", which embraces both simple data types and the XML-derived nodes.

　　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 specifications often need to define a format syntax and are free to employ whatever notation their authors deem useful. Over the years, a modified version of BNF, called ABNF, has been popular among many Internet specifications. It balances compactness and simplicity with reasonable representational 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 is an open, distributed, online directory service which is intended to be global in scope. X.500 is a support service for data exchange which includes providing directory support for data communication services specified by other OSI application standards. The X.500 series of standards covers services available to users, the functional model and protocols connecting the component parts of the directory, an information framework and a schema of the information held by the directory, and a mechanism for allowing OSI components 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。

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