+typedef bool ovsdb_txn_row_cb_func(const struct ovsdb_row *old,
+ const struct ovsdb_row *new,
+ const unsigned long int *changed,
+ void *aux);
+void ovsdb_txn_for_each_change(const struct ovsdb_txn *,
+ ovsdb_txn_row_cb_func *, void *aux);
+
+void ovsdb_txn_add_comment(struct ovsdb_txn *, const char *);
+const char *ovsdb_txn_get_comment(const struct ovsdb_txn *);
+