+ struct ovsdb_datum *old; /* Committed data (null if orphaned). */
+
+ /* Transactional data. */
+ struct ovsdb_datum *new; /* Modified data (null to delete row). */
+ unsigned long int *prereqs; /* Bitmap of columns to verify in "old". */
+ unsigned long int *written; /* Bitmap of columns from "new" to write. */
+ struct hmap_node txn_node; /* Node in ovsdb_idl_txn's list. */