void read_lily_scm_file (String);
void ly_init_guile ();
-bool ly_dir_p (SCM s);
-bool ly_number_pair_p (SCM);
-bool ly_axis_p (SCM);
+bool is_direction (SCM s);
+bool is_number_pair (SCM);
+bool is_axis (SCM);
/*
these conversion functions also do a typecheck on the argument, and