+ static void set_interface (Grob*);
+ static bool has_interface (Grob*);
+ DECLARE_SCHEME_CALLBACK (dim_callback, (SCM smob, SCM axis));
+ DECLARE_SCHEME_CALLBACK (brew_molecule, (SCM ));
+ DECLARE_SCHEME_CALLBACK (height, (SCM,SCM));
+ static void set_stem (Grob*me, Grob *st);