books__book                 = Book
books__book__title__        = Title^100
books__book__edition__      = Edition
books__book__author__       = Author^60
books__book__publisher__    = Publisher^60
books__book__genre__        = Genre
books__book__subject__      = Subject^60
books__book__pages__        = Pages
books__book__year__         = Year^20
books__book__language__     = Language
books__book__SHA1__         = Hash^10
books__book__ISBN__         = ISBN Nr.^80
books__book__back__         = Back
books__book__availability__ = Availability
books__book__price__        = Price
books__book__shipping__     = Shipping Info
books__book__link__         = Link
books__book__comments__     = Comments
books__book__action__ = Action^10
