title: How to express loops in Communication Diagrams?
body: <p>I'd like to know how to express in a Communication Diagram something like:</p>
  <pre><code>foreach (User user in UsersCatalog) {
      list.add(user.getId());
  }
  </code></pre>
  <p>I actually have something like the following</p>
  <p><a href="http://img691.imageshack.us/img691/9213/semttuloyc.png" rel="nofollow noreferrer">alt text http://img691.imageshack.us/img691/9213/semttuloyc.png</a></p>
  <p><em>(Utilizador = User)</em></p>
  <p>but as you'll notice it does not represent well the fact that I am doing something like a loop.</p>
  <p>How can I accomplish this?</p>