struct Performer;
struct Performer_group_performer;
struct Property_iterator;
+struct Ps_score;
+struct Ps_def;
struct Ps_lookup;
struct Ps_outputter;
struct Ps_stream;
struct Super_element;
struct Translation_property;
struct Tempo_req;
+struct Tex_def;
+struct Tex_score;
struct Tex_lookup;
struct Tex_outputter;
struct Tex_stream;