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<p>The callouts extension processes <a href="http://docbook.org/tdg5/en/html/areaset.html"><code class="sgmltag-element">areaset</code></a>
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elements in <a href="http://docbook.org/tdg5/en/html/programlistingco.html"><code class="sgmltag-element">ProgramListingCO</code></a> and other text-based