title: How do I represent a loop in an activity diagram?
body: <p>I'd like to represent a loop in a UML activity diagram. Here's my situation:  </p>
  
  <ul>
  <li>For each folder, I check each document within that folder</li>
  <li>For each document I check its content:
  
  <ul>
  <li>If it's invalid (based on keyword searching), do action X and pass to next document. </li>
  </ul></li>
  <li>When all document are verified, continue to the next folder.</li>
  </ul>
  
  <p>Can anyone show me what this should look like?</p>