title: Add category with different logging levels to different appenders in log4j
body: <p>I would like to have to file loggers configured that log category 'x' in a way that</p>
  
  <ul>
  <li>logger one logs 'x' on INFO level and other stuff at DEBUG level</li>
  <li>logger two logs 'x' on DEBUG level</li>
  </ul>
  
  <p>I've seen examples that use Threshold to achieve different logging levels for the same category in different appenders. In this case it does not seem to be a valid solution as in both appenders i would like to have at least one category at DEBUG level.</p>
  
  <p>I've tried to do something like:</p>
  
  <pre><code>&lt;appender name="FILE_ONE" class="org.jboss.logging.appender.DailyRollingFileAppender"&gt;
  ...
  &lt;/appender&gt;
  &lt;appender name="FILE_TWO" class="org.jboss.logging.appender.DailyRollingFileAppender"&gt;
  ...
  &lt;/appender&gt;
  
  &lt;category name="y"&gt;
      &lt;priority value="DEBUG"/&gt;
      &lt;appender-ref ref="FILE_ONE"/&gt;
  &lt;/category&gt;
  &lt;category name="x"&gt;
      &lt;priority value="INFO"/&gt;
      &lt;appender-ref ref="FILE_ONE"/&gt;
  &lt;/category&gt;
  &lt;category name="x"&gt;
      &lt;priority value="DEBUG"/&gt;
      &lt;appender-ref ref="FILE_TWO"/&gt;
  &lt;/category&gt;
  </code></pre>
  
  <p>but second category declaration overrides the first one.</p>
  
  <p>Is this even possible to do that?</p>