int score_update(const struct osl_row *aft_row, long new_score);
int score_delete(const struct osl_row *aft_row);
int clear_score_table(void);
-int row_belongs_to_score_table(const struct osl_row *aft_row, unsigned *rank);
+bool row_belongs_to_score_table(const struct osl_row *aft_row);
/* attribute */
void attribute_init(struct afs_table *t);