Attachments (extra files) to include in the epub.
The author of the book.
The chapters of the book, in the order to present them.
The cover page to generate. If not set, no cover page is generated.
The attachment to use as a cover image.
The fileid of the cover image, which should be present as an attachment.
The ID of the book. If you don't specify one, we will create it for you.
The title of the book.
A Book is the object model for an epub file.