软考英语精典短文每日一练(2006-07-03).htm

软考英语精典短文每日一练汇总 软考英语精典短文每日一练汇总

      the WWW, XML was defined as a functional subset (a "profile") of SGML. XML 
      defines types (often referred to as "schemas" or "document classes") with 
      DTDs, which originate from the document-centered view of SGML. However, 
      XML is very successful in B2B scenarios, and as such is increasingly used 
      for data exchange (as opposed to document exchange). Because data 
      description requires other features than document description (e.g., 
      built-in data types and type derivation), XML Schema has been defined as a 
      replacement for DTDs, which makes XML more usable for B2B 
      scenarios.<BR><BR></DIV></TD></TR>
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      <DIV class=userInfoBox>积分：4267<BR>第二级</DIV>
      <DIV class=userInfoBox>注册时间<BR>2003-4-4</DIV></DIV></TD>
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      <DIV class=TitleInfoBox align=right>发表时间：2006-7-4 14:48:13　　　第1楼</DIV>
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      <DIV id=cont_right 
      style="WIDTH: 495px">XML是一个针对任一数据的结构化标志性语言。XML设计出来是用于代替HTML这个被认为过于严格又被固定了一系列要素和属性的语言。因为HTML基于SGML，但是SGML本身被认为太复杂而不能应用于WWW上，XML被定义为SGML的一个功能子集（一个侧面）。XML使用DTD这个最初以文档为中心的SGML视图来定义类型（通常被称为“schemas”或者 
      “文档类”）。XML在B2B的应用中非常成功，同时越来越多的应用于数据交换（不用于文档交换）。由于数据描述比文档描述要求更多其它的特征（例如，嵌入数据类型和类型出处），XML 
      Schema 是作为DTD的替代者而设计出来的，它使得XML在B2B的环境下更好用。</DIV></TD></TR>
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      <DIV class=userInfoBox>积分：4267<BR>第二级</DIV>
      <DIV class=userInfoBox>注册时间<BR>2003-4-4</DIV></DIV></TD>
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      <DIV class=TitleInfoBox align=right>发表时间：2006-7-4 14:50:39　　　第2楼</DIV>
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      <DIV id=cont_right style="WIDTH: 495px">XML 由DTD &#8226; PI组成<BR><BR>XML 
      是WebSGML的子集<BR><BR>XML 是基于Unicode的<BR><BR>XML 有IE &#8226; Navigator &#8226; Opera &#8226; 
      XML Spy这些工具支持<BR><BR>XML 
      是由W3C组织来制定的。<BR><BR>XML的权威描述见http://www.w3.org/XML<BR><BR>XML的拓展介绍见http://www.oasis-open.org/cover 
      http://www.isgmlug.org/ http://skew.org/xml/tutorial/ 
      http://www.xmlsoftware.com/<BR><BR></DIV></TD></TR>
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