title: What is the relationship between XNA and XNA for Windows Phone?
body: <p>What is the relationship between XNA and XNA for Windows Phone? </p>
  
  <p>Is that latter a true subset of the former like the .NET Client Profile?</p>
  
  <p>Mostly a subset (like Silverlight vs Silverlight for Windows Phone)?</p>
  
  <p>Or is it simply a similar API like WPF vs Silverlight?</p>