title: Compass output_style
body: <p>Has anyone found any documentation of what the different values for output_style in Compass mean? The options are :expanded, :nested, :compact and :compressed. I can see what the last one is, but what do the others do?</p>
  
  <p>Seems a bit of a waste that I have to recompile all my CSS to figure out what these different options produce.</p>