title: Active class versus passive class
body: <p><strong>In UML specification superstructure 2.5(still Beta, page 203)</strong></p>
  
  <blockquote>
    <p>A Class may be designated by setting isActive to true as active (i.e.,
    each of its instances is an active object). When isActive is false the
    Class is passive (i.e., each of its instances executes within the
    context of some other object).</p>
  </blockquote>
  
  <ul>
  <li>I wonder if there is a simple example illustrates the differences in applying each one of them?</li>
  <li>And elaborate this concept a bit?</li>
  </ul>