<bookpartno> element contains the book's part number, such as
99F1234. A publisher might use a number like this one to
identify a book for tracking purposes.
See appendix for information about this element in OASIS document type shells.
- topic/data bookmap/bookpartno
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>