int uc_get_state (const data_set_t *ds, const value_list_t *vl);
int uc_set_state (const data_set_t *ds, const value_list_t *vl, int state);
int uc_get_state (const data_set_t *ds, const value_list_t *vl);
int uc_set_state (const data_set_t *ds, const value_list_t *vl, int state);