title: How to handle a named parameter and @keyword in robotframework
body: <p>I use the Robot framework with Python and Linux.</p>
  
  <p>I don't know how to use the optional named parameter <code>b</code> and <code>c</code> in the decorator. Can somebody explain?</p>
  
  <p>See example below:</p>
  
  <pre><code>@keyword('Starting a "${a}" b "${b}"?? c "${c}"??')
  def Start(self, a, b='', c=''):
     foo
  </code></pre>