title: How to depict the "include" & "extend" link between use cases in sequence and activity diagrams
body: <p>I have a problem in "include" &amp; "extend" relation between my principal use cases.</p>
  
  <p>I`m using IBM Rational harmony-SE in IBM rhapsody tools. The issue is, how to depict the link between them self, in activity or in sequence diagrams?</p>
  
  <p>In rhapsody, when you want to create a sequence diagram of a use cases, you can  use Harmony Toolkit that draws automatically do that, but in a generated Sequence diagram, Harmony Toolkit doesn't consider the "include" and "extend" relation between use cases.</p>
  
  <p>How can I solve this?</p>