+const struct ovsdb_datum *ovsdb_idl_read(const struct ovsdb_idl_row *,
+ const struct ovsdb_idl_column *);
+const struct ovsdb_datum *ovsdb_idl_get(const struct ovsdb_idl_row *,
+ const struct ovsdb_idl_column *,
+ enum ovsdb_atomic_type key_type,
+ enum ovsdb_atomic_type value_type);
+