I´m almost finishing a plugin that will create new educational metadata for my PB Installation. All that require an educational digital book and more.
I do think, Article could be a more apropiate type , instead of Chapter and we could use Chapter with the Parts.
Since a texbook is a book with a combination of articles. I think is the most apropiate.
Also we will receive the benefits of google with the rich snippets.
Sugestions are welkome.