I've been using this microformat for BookShop. Can I work with you on this? I'd like to help promote this as a standard for publishing houses.
I'm using http://alistapart.com/article/boom as the example template for BookShop, but would like to look at how to incorporate "parts" into the template since I've run into this as a pretty common element in many books I've laidout. There needs to be a standard way of tying this to CSS.