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<DIV class=pt10><B>3.1.2.9 空元素</B></DIV>
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<P>好了，前面我們已經介紹了所有可能用到的子元素的排列狀況。不過，還有一種情況沒有說，那就是，一個元素中不包含任何子元素，也不包含純文本。</P>
<P>對于這種情況，我們可以定義一個空標記。當然，定義這樣一個標記很簡單，你只需要使用關鍵字<STRONG><FONT
color=#ff0000>EMPTY</FONT></STRONG>就可以了，例如：</P>
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<TBODY>
<TR>
<TD width="100%"> <!ELEMENT HR <STRONG><FONT
color=#ff0000>EMPTY</FONT></STRONG>></TD></TR></TBODY></TABLE></CENTER></DIV>
<P>這樣，在你的XML文件中，就可以使用一個空元素<HR/>。</P></DIV>
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