From Than Grove, 2010-08-10: I set up a cocoon pipeline that should work for any book on the cocoon/texts/book site. It should also work for essays etc but I haven't had time to test that yet and there may be glitches.
It gives you: id#, Head in Unicode Tibetan, the head text converted into Wylie down to level of div4s (but there are no div4s in that document).
So the l param is the level to go down to, and the lang can be either "tib" if the header of each section is in Unicode Tibetan and it will translate it to Wylie. If lang=wyl, then it will translate Wylie headers into Unicode Tibetan. If no lang param is given, no conversion happens.