+size_t ovsdb_datum_json_length(const struct ovsdb_datum *,
+ const struct ovsdb_type *);
+
+char *ovsdb_datum_from_string(struct ovsdb_datum *,
+ const struct ovsdb_type *, const char *,
+ struct ovsdb_symbol_table *)
+ WARN_UNUSED_RESULT;
+void ovsdb_datum_to_string(const struct ovsdb_datum *,
+ const struct ovsdb_type *, struct ds *);
+void ovsdb_datum_to_bare(const struct ovsdb_datum *,
+ const struct ovsdb_type *, struct ds *);
+
+void ovsdb_datum_from_smap(struct ovsdb_datum *, struct smap *);