class Beaming_info_list;
class Bezier;
class Bezier_bow;
+class Book;
+class Output_def;
class Break_algorithm;
class Change_iterator;
class Change_translator;
class Lyric_phrasing_engraver;
class Mensural_ligature_engraver;
class Midi_chunk;
-class Midi_def;
class Midi_duration;
class Midi_dynamic;
class Midi_header;
class Music_iterator;
class Music_list;
class Music_output;
-class Music_output_def;
+class Output_def;
class Music_sequence;
class Music_wrapper;
class Music_wrapper_iterator;
class Output_property;
class Paper_book;
class Paper_column;
-class Paper_def;
-class Paper_line;
+class Output_def;
+class Paper_system;
class Paper_outputter;
class Paper_score;
class Paper_stream;
class Event;
class Event_chord;
class Event_chord_iterator;
-class Scaled_font_metric;
+class Modified_font_metric;
class Scheme_hash_table;
class Score;
class Grob;