The booknumber element contains the book's form number, such as SC21-1920.
See appendix for information about this element in OASIS document type shells.
- topic/data bookmap/booknumber
In this example, "99F1234" is a part number assigned to this book by the publisher, while SC21-1234-00 is a number that identifies this book among all of the author's works.
<bookmeta> <bookid> <bookpartno>99F1234</bookpartno> <booknumber>SC21-1234-00</booknumber> </bookid> </bookmeta>