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<p>Sets the filename extension to use on callout graphics. </p>
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<div class="itemizedlist"><p>The Docbook XSL distribution provides callout graphics in the following formats:</p><ul class="itemizedlist" type="disc"><li class="listitem"><p>SVG (extension: <code class="filename">.svg</code>)</p></li><li class="listitem"><p>PNG (extension: <code class="filename">.png</code>)</p></li><li class="listitem"><p>GIF (extension: <code class="filename">.gif</code>)</p></li></ul></div>