Right now it's just reading. My approach is to attack reading first because it is the harder problem (and exposes more features that need to be represented in

Right now it's just reading. My approach is to attack reading first because it is the harder problem (and exposes more features that need to be represented in the internal format). Once I'm confident I've covered what needs to be represented, then writing is easy. Honestly, the biggest challenge here is trying to understand the full scope of the problem -- its huge!