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<h3 class="section">17.4 <code>@set</code>, <code>@clear</code>, and <code>@value</code></h3>
<p>You can direct the Texinfo formatting commands to format or ignore parts
of a Texinfo file with the <code>@set</code>, <code>@clear</code>, <code>@ifset</code>,
and <code>@ifclear</code> commands.
<p>Here are brief descriptions of these commands, see the following
sections for more details:
<dl>
<dt><code>@set </code><var>flag</var><code> [</code><var>value</var><code>]</code><dd>Set the variable <var>flag</var>, to the optional <var>value</var> if specified.
<br><dt><code>@clear </code><var>flag</var><dd>Undefine the variable <var>flag</var>, whether or not it was previously defined.
<br><dt><code>@ifset </code><var>flag</var><dd>If <var>flag</var> is set, text through the next <code>@end ifset</code> command
is formatted. If <var>flag</var> is clear, text through the following
<code>@end ifset</code> command is ignored.
<br><dt><code>@ifclear </code><var>flag</var><dd>If <var>flag</var> is set, text through the next <code>@end ifclear</code> command
is ignored. If <var>flag</var> is clear, text through the following
<code>@end ifclear</code> command is formatted.
</dl>
<ul class="menu">
<li><a accesskey="1" href="set-value.html#set-value">set value</a>: Expand a flag variable to a string.
<li><a accesskey="2" href="ifset-ifclear.html#ifset-ifclear">ifset ifclear</a>: Format a region if a flag is set.
<li><a accesskey="3" href="value-Example.html#value-Example">value Example</a>: An easy way to update edition information.
</ul>
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