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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>
<font size="+1">

<ul>
	<li>Expressions to describe children:
		<br><br>
		<table border='1'>
			<tr bgcolor='#00ffff'>
				<th>Rule Description</th>
				<th>Element Content</th>
			</tr>
			<tr>
				<td align='center'><tt>EMPTY</tt></td>
				<td align='center'>No children allowed</td>
			</tr>
			<tr>
				<td align='center'>(E*)</td>
				<td align='center'>Any sequence of 0 or more elements E</td>
			</tr>
			<tr>
				<td align='center'>(E+)</td>
				<td align='center'>Any sequence of 1 or more elements E</td>
			</tr>
			<tr>
				<td align='center'>(E?)</td>
				<td align='center'>Optional element E (0 or 1)</td>
			</tr>
			<tr>
				<td align='center'>(E1, E2, . . .)</td>
				<td align='center'>Element E1, followed by E2, ...</td>
			</tr>
			<tr>
				<td align='center'>(E1|E2|. . .)</td>
				<td align='center'>Element E1 or E2 or ...</td>
			</tr>
			<tr>
				<td align='center'>(<tt>#PCDATA</tt>)</td>
				<td align='center'>Text only (parsable)</td>
			</tr>
			<tr>
				<td align='center'>(<tt>#PCDATA</tt>|E1|E2|. . .)*</td>
				<td align='center'>Any sequence of text and elements E1, E2, ..., in
					any order</td>
			</tr>
			<tr>
				<td align='center'><tt>ANY</tt></td>
				<td align='center'>Any children allowed</td>
			</tr>
		</table>
	</li>
</ul>

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