The number that was printed/displayed as part of the original appearance of a book component’s title. For a title originally printed as “Chapter 14 Large Dogs”, the <title> element would contain the actual title “Large Dogs”, but the book-part-type and book-part-number attributes associated with the <book-part> element would have the values “chapter” and “14” respectively.
| Value | Meaning |
|---|---|
| A number | An integer number, for example, “14”, for a book component title originally printed as “Chapter 14 Large Dogs” |
| Restriction: This attribute may be specified if the element is used. | |