title: Xamarin Forms Project with netstandard: can't build UWP
body: <p>currently I'm working on a Xamarin app, which uses the .Net-Standard code sharing strategy.
  While I ca build and run the succesfully on android, i have some problems with the UWP project.</p>
  <p>When I try to build the project I'm receiving this error messages:</p>
  <blockquote>
  <p>Could not copy the file &quot;obj\x86\Debug\myapp.UWP.xr.xml&quot; because it
  was not found.</p>
  <p>Could not copy the file &quot;obj\x86\Debug\MainPage.xbf&quot; because it was
  not found.</p>
  <p>Could not copy the file &quot;obj\x86\Debug\App.xbf&quot; because
  it was not found.</p>
  <p>Cannot resolve Assembly or Windows Metadata file 'Type universe cannot
  resolve assembly: myapp.Basic, Version=1.0.0.0, Culture=neutral,
  PublicKeyToken=null.'</p>
  </blockquote>
  <p>While I was looking for these error messages I found this thread on stackoverflow:</p>
  <p><a href="https://stackoverflow.com/questions/34847919/missing-xaml-xr-of-a-class-library-file-in-uwp">Missing xaml.xr of a class library file in UWP</a></p>
  <p>The thread suggestes to enable the &quot;Generate library layout&quot; in projects that contains XAML-code, which looked very promising, because the myapp.Basic Project contains some XAML-code. Unluckily this option is totaly missing in .Net-standard projects.</p>
  <p>Can anybody help me solve this problem?</p>