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📁 XML是一种新的技术
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          <TH vAlign=center align=middle width="20%" colSpan=2 
          height=19>表现内容</TH>
          <TH vAlign=center width="30%" height=19>DTD</TH>
          <TH vAlign=center width="30%" height=19>Schema</TH>
          <TH vAlign=center align=middle width="20%" colSpan=4 
          height=19>合法实例</TH></TR>
        <TR>
          <TD align=middle width="20%" colSpan=2 height=48>空元素</TD>
          <TD vAlign=center align=left width="30%" height=48>&lt;!ELEMENT a 
            EMPTY&gt;</TD>
          <TD vAlign=center align=left width="30%" height=48>&lt;ElementType 
            name="a" content="empty"/&gt;</TD>
          <TD vAlign=center width="10%" colSpan=2 height=48>&lt;a/&gt;</TD>
          <TD vAlign=center width="10%" colSpan=2 
          height=48>&lt;a&gt;&lt;/a&gt;</TD></TR>
        <TR>
          <TD align=middle width="20%" colSpan=2 height=48>字符串</TD>
          <TD vAlign=center align=left width="30%" height=48>&lt;!ELEMENT a 
            (#PCDATA)&gt;</TD>
          <TD vAlign=center align=left width="30%" height=48>&lt;ElementType 
            name="a" content="textOnly"/&gt;</TD>
          <TD vAlign=center width="20%" colSpan=4 
            height=48>&lt;a&gt;<BR>abcdefg<BR>&lt;/a&gt;</TD></TR>
        <TR>
          <TD vAlign=center align=middle width="5%" height=65 rowSpan=10>父
            <P>元</P>
            <P>素</P></TD>
          <TD align=middle width="12%" height=17>一个子元素</TD>
          <TD vAlign=center align=left width="30%" height=17>&lt;!ELEMENT a 
            (b)&gt;</TD>
          <TD vAlign=center align=left width="30%" height=17>&lt;ElementType 
            name="a" content="eltOnly"&gt; <BR>&nbsp; &lt;element 
            type="b"/&gt;&lt;/ElementType&gt;</TD>
          <TD vAlign=center width="20%" colSpan=4 
            height=17>&lt;a&gt;<BR>&nbsp; &lt;b/&gt;<BR>&lt;/a&gt;</TD></TR>
        <TR>
          <TD align=middle width="12%" height=16>有顺序的<BR>子元素</TD>
          <TD vAlign=center align=left width="30%" height=16>&lt;!ELEMENT a 
            (b, c)&gt;</TD>
          <TD vAlign=center align=left width="30%" height=16>&lt;ElementType 
            name="a" order="seq"&gt;<BR>&nbsp; &lt;element 
            type="b"/&gt;<BR>&nbsp; &lt;element 
          type="c"/&gt;&lt;/ElementType&gt;</TD>
          <TD vAlign=center width="20%" colSpan=4 
            height=16>&lt;a&gt;<BR>&nbsp; &lt;b/&gt;<BR>&nbsp; 
            &lt;c/&gt;<BR>&lt;/a&gt;</TD></TR>
        <TR>
          <TD align=middle width="12%" height=8>OR或</TD>
          <TD vAlign=center align=left width="30%" height=8>&lt;!ELEMENT a (b 
            | c)&gt;</TD>
          <TD vAlign=center align=left width="30%" height=8>&lt;ElementType 
            name="a" order="one"&gt; <BR>&nbsp; &lt;element type="b"/&gt; 
            <BR>&nbsp; &lt;element type="c"/&gt;&lt;/ElementType&gt;</TD>
          <TD vAlign=center width="10%" colSpan=2 height=8>&lt;a&gt;<BR>&nbsp; 
            &lt;b/&gt;<BR>&lt;/a&gt;</TD>
          <TD vAlign=center width="10%" colSpan=2 height=8>&lt;a&gt;<BR>&nbsp; 
            &lt;c/&gt;<BR>&lt;/a&gt;</TD></TR>
        <TR>
          <TD align=middle width="12%" height=8 rowSpan=3>任意顺序（或不出现）的子元素</TD>
          <TD vAlign=center align=left width="30%" height=8 
            rowSpan=3>&lt;!ELEMENT a (b | c)*&gt;</TD>
          <TD vAlign=center align=left width="30%" height=8 
            rowSpan=3>&lt;ElementType name="a" order="many"&gt; <BR>&nbsp; 
            &lt;element type="b"/&gt; <BR>&nbsp; &lt;element 
            type="c"/&gt;&lt;/ElementType&gt;</TD>
          <TD vAlign=center width="20%" colSpan=4 height=3>&lt;a/&gt;</TD></TR>
        <TR>
          <TD vAlign=center width="10%" colSpan=2 height=3>&lt;a&gt;<BR>&nbsp; 
            &lt;b/&gt;<BR>&lt;/a&gt;</TD>
          <TD vAlign=center width="10%" colSpan=2 height=3>&lt;a&gt;<BR>&nbsp; 
            &lt;c/&gt;<BR>&lt;/a&gt;</TD></TR>
        <TR>
          <TD vAlign=center width="10%" colSpan=2 height=2>&lt;a&gt;<BR>&nbsp; 
            &lt;b/&gt;<BR>&nbsp; &lt;c/&gt;<BR>&lt;/a&gt;</TD>
          <TD vAlign=center width="10%" colSpan=2 height=2>&lt;a&gt;<BR>&nbsp; 
            &lt;c/&gt;<BR>&nbsp; &lt;b/&gt;<BR>&lt;/a&gt;</TD></TR>
        <TR>
          <TD align=middle width="12%" height=8>可选子元素</TD>
          <TD vAlign=center align=left width="30%" height=8>&lt;!ELEMENT a 
            (b?)&gt;</TD>
          <TD vAlign=center align=left width="30%" height=8>&lt;ElementType 
            name="a" content="eltOnly"&gt; <BR>&nbsp; &lt;element type="b" 
            minOccurs="0" maxOccurs="1"/&gt;&lt;/ElementType&gt;</TD>
          <TD vAlign=center width="10%" colSpan=2 height=8>&lt;a/&gt;</TD>
          <TD vAlign=center width="10%" colSpan=2 height=8>&lt;a&gt;<BR>&nbsp; 
            &lt;b/&gt;<BR>&lt;/a&gt;</TD></TR>
        <TR>
          <TD align=middle width="12%" height=2>"+"型重复元素</TD>
          <TD vAlign=center align=left width="30%" height=2>&lt;!ELEMENT a 
            (b+)&gt;</TD>
          <TD vAlign=center align=left width="30%" height=2>&lt;ElementType 
            name="a" content="eltOnly"&gt; <BR>&nbsp; &lt;element type="b" 
            minOccurs="1" maxOccurs="*"/&gt;&lt;/ElementType&gt;</TD>
          <TD vAlign=center width="10%" colSpan=2 height=2>&lt;a&gt;<BR>&nbsp; 
            &lt;b/&gt;<BR>&lt;/a&gt;</TD>
          <TD vAlign=center width="10%" colSpan=2 height=2>&lt;a&gt;<BR>&nbsp; 
            &lt;b/&gt;<BR>&nbsp; &lt;b/&gt;<BR>&lt;/a&gt;</TD></TR>
        <TR>
          <TD align=middle width="12%" height=2>"*"型重复元素</TD>
          <TD vAlign=center align=left width="30%" height=2>&lt;!ELEMENT a 
            (b*)&gt;</TD>
          <TD vAlign=center align=left width="30%" height=2>&lt;ElementType 
            name="a" content="eltOnly"&gt; <BR>&nbsp; &lt;element type="b" 
            minOccurs="0" maxOccurs="*"/&gt;&lt;/ElementType&gt;</TD>
          <TD vAlign=center width="6%" height=2>&lt;a/&gt;</TD>
          <TD vAlign=center width="7%" colSpan=2 height=2>&lt;a&gt;<BR>&nbsp; 
            &lt;b/&gt;<BR>&lt;/a&gt;</TD>
          <TD vAlign=center width="7%" height=2>&lt;a&gt;<BR>&nbsp; 
            &lt;b/&gt;<BR>&nbsp; &lt;b/&gt;<BR>&lt;/a&gt;</TD></TR>
        <TR>
          <TD align=middle width="12%" height=2>成组元素</TD>
          <TD vAlign=center align=left width="30%" height=2>&lt;!ELEMENT a 
            (b,c)+&gt;</TD>
          <TD vAlign=center align=left width="30%" height=2>&lt;ElementType 
            name="a" content="eltOnly"&gt; <BR>&nbsp; &lt;group order="seq" 
            minOccurs="1" maxOccurs="*"/&gt;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
            &lt;element 
            type="b"/&gt;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
            &lt;element type="c"/&gt;<BR>&nbsp;&nbsp;&nbsp; 
            &lt;/group&gt;<BR>&lt;/ElementType&gt;</TD>
          <TD vAlign=center width="10%" colSpan=2 height=2>&lt;a&gt;<BR>&nbsp; 
            &lt;b/&gt;<BR>&nbsp; &lt;c/&gt;<BR>&lt;/a&gt;</TD>
          <TD vAlign=center width="10%" colSpan=2 height=2>&lt;a&gt;<BR>&nbsp; 
            &lt;b/&gt;<BR>&nbsp; &lt;c/&gt;<BR><BR>&nbsp; &lt;b/&gt;<BR>&nbsp; 
            &lt;c/&gt;<BR>&lt;/a&gt;</TD></TR>
        <TR>
          <TD align=middle width="20%" colSpan=2 height=32 rowSpan=2>混合元素</TD>
          <TD vAlign=center align=left width="30%" height=32 
            rowSpan=2>&lt;!ELEMENT a (#PCDATA | b | c)*&gt;</TD>
          <TD vAlign=center align=left width="30%" height=32 
            rowSpan=2>&lt;ElementType name="a" content="mixed"/&gt;&nbsp; 
            <BR>&nbsp; &lt;element type="b"/&gt;<BR>&nbsp; &lt;element 
            type="c"/&gt;&lt;/ElementType&gt;</TD>
          <TD vAlign=center width="10%" colSpan=2 
            height=16>&lt;a&gt;<BR>abcdefg<BR>&lt;/a&gt;</TD>
          <TD vAlign=center width="10%" colSpan=2 
            height=16>&lt;a&gt;<BR>&nbsp; abcdefg<BR>&nbsp; 
          &lt;b/&gt;<BR>&lt;/a&gt;</TD></TR>
        <TR>
          <TD vAlign=center width="10%" colSpan=2 
            height=16>&lt;a&gt;<BR>&nbsp; &lt;b/&gt;<BR>&nbsp; abcdefg<BR>&nbsp; 
            &lt;c/&gt;<BR>&lt;/a&gt;</TD>
          <TD vAlign=center width="10%" colSpan=2 
            height=16>&lt;a&gt;<BR>&nbsp; abcd<BR>&nbsp; &lt;c/&gt;<BR>&nbsp; 
            efg<BR>&lt;/a&gt;</TD></TR></TBODY></TABLE></CENTER></DIV></DIV>
      <P></P>
      <P></P></TD></TR></TBODY></TABLE>
  </center>
</div>
<P></P>
<P>
<P></P></BODY></HTML>
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