+/* Multiple response sets. */
+const struct mrset *dict_get_mrset (const struct dictionary *, size_t idx);
+size_t dict_get_n_mrsets (const struct dictionary *);
+const struct mrset *dict_lookup_mrset (const struct dictionary *,
+ const char *name);
+
+bool dict_add_mrset (struct dictionary *, struct mrset *);
+bool dict_delete_mrset (struct dictionary *, const char *name);
+void dict_clear_mrsets (struct dictionary *);
+
+/* Variable sets. */
+const struct varset *dict_get_varset (const struct dictionary *, size_t idx);
+size_t dict_get_n_varsets (const struct dictionary *);
+const struct varset *dict_lookup_varset (const struct dictionary *,
+ const char *name);
+
+bool dict_add_varset (struct dictionary *, struct varset *);
+bool dict_delete_varset (struct dictionary *, const char *name);
+void dict_clear_varsets (struct dictionary *);
+