I'm the book's subtitle A Dedication is a section at the very beginning of a book (before any other body matter) containing a tribute to something (frequently someone) in connection with the writing or publication of the Book. Preface is a preface or forward in a Book. The Preface element may appear more than once and should be used for all introductory chapter-like material. For example, a Book might have both a Foreward and an Introduction. Both should be tagged as Prefaces in DocBook.

A section directly inside a chapter. formalpara elements describe a paragraph that has a title.

A section nested within 1 other section.

A section nested 2 deep within other sections.

A section nested 3 deep within other sections.

A section nested 4 deep within other sections.

A sect1 directly inside a chapter. A sect2 nested in a sect1. A sect3 nested in a sect2. A sect4 nested in a sect3. A sect5 nested in a sect4. This book 'part' doesn't actually contain any chapters. A Glossary contains a collection of terms and brief descriptions or definitions of those terms. Term A Glossary must have some content A Colophon, if present, almost always occurs at the very end of a book. It contains factual information about the book, especially about its production, and includes details about typographic style, the fonts used, the paper used, and perhaps the binding method of the book.