計(jì)算機(jī)的英語(yǔ)作文賞析
計(jì)算機(jī)英語(yǔ)經(jīng)典短文：CMS
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被用于數(shù)據(jù)簽名或者任意消息加密中。CMS提供了一套用于數(shù)據(jù)保護(hù)的數(shù)據(jù)封裝語(yǔ)法。該語(yǔ)法支持?jǐn)?shù)據(jù)簽名和數(shù)據(jù)加密。該語(yǔ)法允許多重封裝，所以一封數(shù)據(jù)信封能被另外一封數(shù)據(jù)信封所封裝。同樣的，該語(yǔ)法封裝數(shù)據(jù)的部分?jǐn)?shù)據(jù)位可以用來(lái)表示被封裝數(shù)據(jù)。也允附加一些屬性如簽名時(shí)間，它和內(nèi)容信息一起用于鑒別信息;計(jì)數(shù)器屬性，它為其它屬性提供計(jì)數(shù)信息。
計(jì)算機(jī)英語(yǔ)經(jīng)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的基礎(chǔ)，它定義了XPath2.0的數(shù)據(jù)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(從XML文檔中抽取)和PSVI(作為確認(rèn)XML Schema結(jié)果的XML信息集合的注釋類(lèi)型)的'頂端、屬于簡(jiǎn)單的XML Schema的數(shù)據(jù)類(lèi)型、是一個(gè)附加的概念。其中，它最重要的附加概念就是“順序”，即包括簡(jiǎn)單數(shù)據(jù)類(lèi)型和XML的源節(jié)點(diǎn)。
計(jì)算機(jī)英語(yǔ)經(jīng)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.
互聯(lián)網(wǎng)技術(shù)規(guī)范經(jīng)常需要定義一種格式化語(yǔ)法并能自由地使用作者認(rèn)為是有用的任何符號(hào)。多年來(lái)，巴克斯范式（BNF）的一個(gè)修訂版，即擴(kuò)展巴克斯范式（ABNF），已經(jīng)在許多互聯(lián)網(wǎng)規(guī)范中流行。該版本平衡了壓縮性和簡(jiǎn)單性，具有合理的表達(dá)能力。
計(jì)算機(jī)英語(yǔ)經(jīng)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是一個(gè)開(kāi)放的、分布式的、趨向于全球化的在線(xiàn)目錄服務(wù)。X.500支持?jǐn)?shù)據(jù)交換服務(wù)，該服務(wù)符合OSI模型和其他應(yīng)用協(xié)議下的數(shù)據(jù)傳送的目錄服務(wù)。X.500這一系列標(biāo)準(zhǔn)涵蓋了可用的用戶(hù)服務(wù)、連接各組成部分的功能和協(xié)議模型、目錄的消息框架和信息保持、OSI模型中各組成部分彼此授權(quán)的支持等多個(gè)方面。
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