ibute()</code> is
           not null. For example, if this value is set to
           <code>important</code>, then a particular request will only be logged
           if <code>ServletRequest.getAttribute("important") != null</code>.
           The use of Filters is an easy way to set/unset the attribute
           in the ServletRequest on many different requests.
        </p>
      </td></tr><tr><td><code class="attributeName">conditionUnless</code></td><td>
        <p>Turns on conditional logging. If set,