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<HTML><HEAD><TITLE>XML中国论坛 - 初学进阶 - 3.1.3.5 枚举类型</TITLE>
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      <DIV class=pt10><B>3.1.3.5 枚举类型</B></DIV>
    &nbsp;&nbsp;&nbsp;
      <DIV></DIV><BR>
      <DIV class=pt9>
      <P>属性也可以被描述为一组可接受的取值的列表，XML文件中对属性的赋值将从这个列表中选取一个值。这类属性属于枚举类型ENUMERATED，不过，关键字ENUMERATED是不出现在DTD定义中的。</P>
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            <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; encoding="GB2312" 
            <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; standalone = 
            "yes"?&gt;<BR>&lt;!DOCTYPE 购物篮 [<BR>&nbsp;&nbsp;&nbsp; &lt;!ELEMENT 
            购物篮 ANY&gt;<BR>&nbsp;&nbsp;&nbsp; &lt;!ELEMENT 肉 
            EMPTY&gt;<BR>&nbsp;&nbsp;&nbsp; &lt;!ATTLIST 肉 类型( 鸡肉 | 牛肉 | 猪肉 | 鱼肉 
            ) "鸡肉"&gt;<BR>&nbsp;&nbsp;&nbsp; ]&gt;
            <P>&lt;购物篮&gt;<BR>&nbsp;&nbsp;&nbsp; &lt;肉 类型 = 
            "鱼肉"/&gt;<BR>&nbsp;&nbsp;&nbsp; &lt;肉 类型 = 
            "牛肉"/&gt;<BR>&nbsp;&nbsp;&nbsp; 
        &lt;肉/&gt;<BR>&lt;/购物篮&gt;</P></TD></TR></TBODY></TABLE></CENTER></DIV>
      <P>注意，在上面这个例子中，给属性“类型”定义的缺省值是“鸡肉”，所以“购物篮”中的第三个元素的“类型”属性取值为“鸡肉”。</P></DIV>
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