5 A second bookpart-level header block shall retain previously set values from a first header block at the same or higher levels unless overriden.
9 \header { composer = "Composer correct (set at top level)" }
12 title = "Title correct (set in book)"
13 subtitle = "Subtitle incorrect (to be superseded in bookpart)"
17 subtitle = "Subtitle correct (superseded in bookpart)"
18 piece = "Piece incorrect (to be superseded at bookpart level)"
21 piece = "Piece correct (superseded at bookpart level)"
24 \markup { \bold Note: expect title, subtitle, piece and composer. }