My notes for the first half of this chapter are things like "easy!" and "it's that easy!" 
so I think i've got that down all right. However, I do have one other note:

p. 204: "Though it is rarely necessary, this default algorithm [the traversal 
algorithm] can be swapped out selectively for a different traversal pattern via 
configuration." Why would it ever be necessary to change the traversal algorithm? 
Especially since changing the algorithm messes with the ModelURL generator and 
other things.