  </p>
<div class="important"><table border="0" summary="Important">
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<td rowspan="2" align="center" valign="top" width="25"><img alt="[Important]" src="../../../../doc/src/images/important.png"></td>
<th align="left">Important</th>
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<tr><td align="left" valign="top"><p>
          Be careful when using the escape. The text must conform to <a href="http://www.boost.org/doc/html/boostbook.html" target="_top">BoostBook</a>/<a href="http://www.docbook.org/" target="_top">DocBook</a> syntax.
        </p