struct Absolute_dynamic_req;
+struct Abbreviation;
struct Abbreviation_req;
struct Abbreviation_beam_req;
struct Abbreviation_beam_engraver;
struct Beam_engraver;
struct Beam_req;
struct Blank_req;
+struct Bow;
struct Box;
struct Break_align_item;
struct Bracket_req;
struct Dynamic_req;
struct Element_group;
struct Element_group_item;
+struct Break_force_req;
struct General_script_def;
struct Graphical_element;
struct Music_output;
struct Paper_def;
struct Partial_measure_req;
struct Plet;
+struct Plet_engraver;
+struct Plet_req;
+struct Plet_spanner;
struct Pulk_voice;
struct Pulk_voices;
struct Rational;
struct Rest;
struct Rest_collision;
struct Rest_collision_engraver;
-struct Rest_column;
struct Rest_req;
struct Rhythmic_grouping;
struct Rhythmic_head;
struct Stem_req;
struct String;
struct Subtle_req;
-struct Symbol;
+struct Atom;
struct Symtable;
struct Symtables;
struct Super_elem;
struct Text_item ;
struct Text_engraver;
struct Text_req;
+struct Text_spanner;
struct Tie;
struct Tie_engraver;
struct Tie_req;