void assign_context_def (Output_def *m, SCM transdef);
SCM find_context_def (Output_def const *m, SCM name);
+int get_tempo (Output_def*def, Moment moment);
+void set_tempo (Output_def*def, Moment moment, int count_per_minute_i);
+
Interval line_dimensions_int (Output_def*def, int);