void set_identifier (SCM path, SCM val);
int get_state () const;
bool is_note_state () const;
bool is_chord_state () const;
bool is_lyric_state () const;
bool is_figure_state () const;
void set_identifier (SCM path, SCM val);
int get_state () const;
bool is_note_state () const;
bool is_chord_state () const;
bool is_lyric_state () const;
bool is_figure_state () const;