title: How to represent data base in swim lane diagram?
body: <p>I'm modelling a process of <em>police dispatch systems</em> with <code>swim lane diagram</code>. </p>
  
  <p>I want to show that all the actors (operators that receive calls and police personnel) access one common database. </p>
  
  <p>What are various ways to represent databases in <code>swim lane diagrams</code>?</p>
  
  <p>And I want to show that police dispatch system is interfaced with ambulance and fire services. </p>
  
  <p>How can i show this interface?</p>