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<HTML><HEAD><TITLE>XML中国论坛 - 初学进阶 - 2.2.1 XML文件的整体结构</TITLE>
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      <DIV class=pt10><B>2.2.1 XML文件的整体结构</B></DIV>
  &nbsp;&nbsp;&nbsp;
      <DIV></DIV><BR>
      <DIV class=pt9>
      <P>XML文件的结构包括逻辑结构和物理结构。在这一节里,我们首先来看一看XML文件的逻辑结构。</P>
      <P>下面是一个例子,它是有关专有名词解释的XML文件:</P>
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          <TD width="80%">[1] &lt;?xml version="1.0" encoding="GB2312" 
            standalone="no"?&gt;<BR>[2] &lt;?xml-stylesheet type="text/xsl" 
            href="mystyle.xsl"?&gt;<BR><BR>[3] &lt;专有名词列表&gt;<BR>[4] 
            &nbsp;&nbsp;&nbsp; &lt;专有名词&gt;<BR>[5] 
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;名词&gt;XML&lt;/名词&gt; 
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <BR>[6] 
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
            &lt;解释&gt;XML是一种可扩展的源置标语言,它可用以规定新的置标规则,并根据这个规则组织数据&lt;/解释&gt;<BR>[7] 
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;示例&gt;<BR>[8] 
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
            &lt;!-- 一个XML的例子 --&gt;<BR>[9] 
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
            &lt;![CDATA[<BR>[10]&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
            &lt;联系人&gt;<BR>[11]&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
            &lt;姓名&gt;张三&lt;/姓名&gt;<BR>[12]&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
            &lt;EMAIL&gt;zhang@aaa.com&lt;/EMAIL&gt;<BR>[13]&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
            &lt;/联系人&gt;<BR>[14]&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
            ]]&gt;<BR>[15]&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
            &lt;/示例&gt;<BR>[16]&nbsp;&nbsp;&nbsp; 
            &lt;/专有名词&gt;<BR>[17]&lt;/专有名词列表&gt;</TD></TR></TBODY></TABLE></CENTER></DIV>
      <P>一个XML文件最基本的构成是</P>
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          <TD width="100%">&nbsp;&nbsp;&nbsp; XML声明<BR>&nbsp;&nbsp;&nbsp; 
            处理指示(可选)<BR>&nbsp;&nbsp;&nbsp; 
      XML元素</TD></TR></TBODY></TABLE></CENTER></DIV>
      <P>在本例中,<FONT color=#0000ff>[1] </FONT><FONT 
      color=#000000>是一个<EM>XML声明</EM>,</FONT><FONT color=#0000ff>[3]——[17] 
      </FONT><FONT color=#000000>是文件中的各个<EM>元素</EM>。</FONT></P>
      <P><FONT color=#000000>除此以外,上面例子中出现的其它逻辑要素还有:</FONT></P>
      <P>&nbsp;&nbsp; <FONT color=#0000ff>[1][2] </FONT><FONT 
      color=#000000>是<EM>处理指示</EM></FONT><BR><FONT 
      color=#0000ff>&nbsp;&nbsp;&nbsp; [8] </FONT><FONT 
      color=#000000>是<EM>注释</EM></FONT><BR><FONT 
      color=#0000ff>&nbsp;&nbsp;&nbsp; [9]——[14] </FONT><FONT 
      color=#000000>是<EM>CDATA</EM><BR>&nbsp;&nbsp;&nbsp; 在</FONT><FONT 
      color=#0000ff>[5]</FONT><FONT 
      color=#000000>行的“&lt;名词&gt;XML&lt;/名词&gt;”中,“&lt;名词&gt;”“&lt;/名词&gt;”是<EM>标记</EM>,“XML”是<EM>字符数据</EM>。</FONT></P>
      <P>下面几个小节中,我们就来详细讲述这些逻辑要素和与它们相关的语法规则。</P></DIV>
      <P></P>
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