(:chapter :id "introduction"
          (:title "Introduction")
          (:para "This is the introduction. It has two sections")
          (:sect1 :id "about-this-book"
                            (:title "About this book")
                            (:para "This is my first DocBook file"))
          (:sect1 :id "work-in-progress"
                  (:title "Warning")
                  (:para "This is still under construction")))