title: log4net configuration: Can I refer to the same layout in several appenders?
body: <p>I want to send log messages to several files (i.e. different appenders) based upon some property of the message.</p>
  
  <p>The problem is that each <code>appender</code> needs to specify quite a verbose <code>layout</code> (that contains a compication conversionPattern and a couple of converters).  I have ended up duplicating this configuration in each <code>appender</code>.  This works but is not ideal as it makes the config much longer than I would like as well as the pain of having to update 3 complicated bit of configuration when the layout changes.</p>
  
  <p>I want to be able to define the layout once and have all my appenders refer back to that one definition (in the same way that several loggers can refer to the same appender).  But perhaps there is a better way to achieve my goal of reducing duplication in the configuration?</p>
  
  <p>My google-foo is weak and I could not find an answer.   Can anyone here help?</p>
  
  <p>TIA.</p>