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📁 《Big C++ 》Third Edition电子书和代码全集-Part1

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<h2><font color="#009999">29.4 Document Type Definitions (cont.)</font></h2>
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<ul>
	<li>To specify finite choices:
		<blockquote><tt>
			&lt;!ATTLIST price currency (USD | EUR | JPY) #REQUIRED&gt;
		</tt></blockquote>
	</li>
	<li>Choices may contain letters, numbers, <tt>-</tt>, <tt>_</tt> or
		<tt>.</tt></li>
	<li><tt>currency</tt> attribute <b>must</b> be specified</li>
	<li>Attribute Defaults:</li>
	<br>
	<table border='1'>
		<tr bgcolor='#00ffff'>
			<th>Default Declaration</th>
			<th>Explanation</th>
		</tr>
		<tr>
			<td align='center'><tt>#REQUIRED</tt></td>
			<td align='center'>Attribute is required</td>
		</tr>
		<tr>
			<td align='center'><tt>#IMPLIED</tt></td>
			<td align='center'>Attribute is optional</td>
		</tr>
		<tr>
			<td align='center'><i>N</i></td>
			<td align='center'>Default attribute, used if attribute not
				specified</td>
		</tr>
		<tr>
			<td align='center'><tt>#FIXED</tt> <i>N</i></td>
			<td align='center'>Attribute must either be unspecified or contain
				this value</td>
		</tr>
	</table>
</ul>

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