- Group_interface (Score_element const*);
- Group_interface (Score_element const*, String);
- int count ();
- void add_thing (SCM);
- bool has_interface_b ();
- void set_interface ();
- void add_element (Score_element*);
+ static int count (Grob* , String);
+ static void add_thing (Grob*, SCM, SCM);
+ static void add_thing (Grob*, String nm, SCM);