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📄 0301-0205.htm

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<HTML><HEAD><TITLE>XML中国论坛 - 初学进阶 - 3.1.2.5 成组元素</TITLE>
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<BODY vLink=#000000 aLink=#000000 link=#000000 leftMargin=0 topMargin=0 
onload=""><!-- 以下为主体内容 -->
<div align="center">
  <center>
<TABLE width="100%" border=0 style="border-collapse: collapse" bordercolor="#111111" cellpadding="0" cellspacing="0">
  <TBODY>
  <TR vAlign=top>
    <TD width=31 rowSpan=2></TD>
    <TD vAlign=center width=518><IMG height=33 
      src="image/title_learner.gif" width=226></TD>
    <TD width=37 rowSpan=2></TD>
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    <TD width="518" ><!-- 正文内容 -->
      <DIV class=pt10><B>3.1.2.5 成组元素</B></DIV>
     &nbsp;&nbsp;&nbsp;
      <DIV></DIV><BR>
      <DIV class=pt9>
      <P>子元素可以使用括号并为一组。因此，下面的DTD片段说明，一个“联系人”元素中可以有一个或多个“姓名/EMAIL”子元素对，并且在每个子元素对中，“姓名”都放在“EMAIL”之前。</P>
      <DIV align=center>
      <CENTER>
      <TABLE width="80%" border=1>
        <TBODY>
        <TR>
          <TD width="100%">&nbsp;&nbsp;&nbsp; &lt;!ELEMENT 
            联系人(姓名，EMAIL)+&gt;<BR>&nbsp;&nbsp;&nbsp; &lt;!ELEMENT 
            姓名(#PCDATA)&gt;<BR>&nbsp;&nbsp;&nbsp; &lt;!ELEMENT 
          EMAIL(#PCDATA)&gt;</TD></TR></TBODY></TABLE></CENTER></DIV>
      <P>符合这个DTD的XML文件可以是：</P>
      <DIV align=center>
      <CENTER>
      <TABLE width="80%" border=1>
        <TBODY>
        <TR>
          <TD width="100%">&lt;联系人&gt;<BR>&nbsp;&nbsp;&nbsp; 
            &lt;姓名&gt;张三&lt;/姓名&gt;<BR>&nbsp;&nbsp;&nbsp; 
            &lt;EMAIL&gt;zhang@aaa.com&lt;/EMAIL&gt;<BR><BR>&nbsp;&nbsp;&nbsp; 
            &lt;姓名&gt;李四&lt;/姓名&gt;<BR>&nbsp;&nbsp;&nbsp; 
            &lt;EMAIL&gt;li@bbb.org&lt;/EMAIL&gt;<BR><BR>&nbsp;&nbsp;&nbsp; 
            &lt;姓名&gt;王五&lt;/姓名&gt;<BR>&nbsp;&nbsp;&nbsp; 
            &lt;EMAIL&gt;wang@ccc.org&lt;/EMAIL&gt;&nbsp;&nbsp;&nbsp; 
            <BR>&lt;/联系人&gt;</TD></TR></TBODY></TABLE></CENTER></DIV>
      <P>注意，仅仅是因为“+”由括号里面移到括号外面，元素“联系人”的内容就大大不同了。</P></DIV>
      <P></P>
      <P></P></TD></TR></TBODY></TABLE>
  </center>
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