title: WiX Includes vs Fragments
body: <ul>
  <li>What's the difference between a WiX include (<code>.wxi</code> file) and a WiX fragment (<code>.wxs</code> file)?  </li>
  <li>What are the use cases for each?</li>
  <li>Which <em>should</em> be used and why?</li>
  </ul>