title: WiX properties RefProjectOutputGroups RefTargetDir
body: <p>When referencing projects within WiX projects (*.wixproj) I often saw the code snippet</p>
  
  <pre><code>&lt;ItemGroup&gt;
    &lt;ProjectReference Include="..\Foo.Bar\Foo.Bar.csproj"&gt;
      &lt;Name&gt;Foo.Bar&lt;/Name&gt;
      &lt;Project&gt;{0bd367ce-5072-4161-8447-ff4deed97bd4}&lt;/Project&gt;
      &lt;Private&gt;True&lt;/Private&gt;
      &lt;DoNotHarvest&gt;True&lt;/DoNotHarvest&gt;
      &lt;RefProjectOutputGroups&gt;Binaries;Content;Satellites&lt;/RefProjectOutputGroups&gt;
      &lt;RefTargetDir&gt;INSTALLLOCATION&lt;/RefTargetDir&gt;
    &lt;/ProjectReference&gt;
  &lt;/ItemGroup&gt;
  </code></pre>
  
  <p>Can anyone explain to me what the properties <code>DoNotHarvest</code>, <code>RefProjectOutputGroups</code>, and <code>RefTargetDir</code> mean? Or point to some documentation? I couldn't find anything explaining the meaning of these properties (including the WiX documentation).</p>