Here’s the skeleton for layer-3.dsl.  You still have to define the output.html and output.print entities here (if you’re going to be using this mechanism) but notice how you don’t need to have two different definitions for parent-stylesheet.  This is because I’ve assumed that whatever parent-stylesheet points to will use the same output.html and output.print mechanism.  Remember that layer-2.dsl can’t do this, because Norm’s stylesheets are in physically different files.
	Now, when you use this stylesheet, you must list it on the Jade command line.  Right now, all our changes have been non-intrusive
	Also, of course, notice that parent-stylesheet now points to the layer2.dsl file directly.  So