+/* 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 *);
+
+/* Attributes. */
+struct attrset *dict_get_attributes (const struct dictionary *);
+void dict_set_attributes (struct dictionary *, const struct attrset *);
+bool dict_has_attributes (const struct dictionary *);
+
+/* Data encoding. */
+const char *dict_get_encoding (const struct dictionary *d);
+
+char *dict_id_is_valid__ (const struct dictionary *, const char *id)
+ WARN_UNUSED_RESULT;
+bool dict_id_is_valid (const struct dictionary *, const char *id);
+
+/* Functions to be called upon dictionary changes. */
+struct dict_callbacks
+ {
+ void (*var_added) (struct dictionary *, int, void *);
+ void (*vars_deleted) (struct dictionary *, int dict_index, unsigned int n, void *);
+ void (*var_moved) (struct dictionary *, int new_dict_index, int old_dict_index, void *);
+ void (*var_changed) (struct dictionary *, int, unsigned int, const struct variable *, void *);
+ void (*weight_changed) (struct dictionary *, int, void *);
+ void (*filter_changed) (struct dictionary *, int, void *);
+ void (*split_changed) (struct dictionary *, void *);
+ };
+
+void dict_set_callbacks (struct dictionary *, const struct dict_callbacks *,
+ void *);
+void dict_copy_callbacks (struct dictionary *, const struct dictionary *);
+
+void dict_set_change_callback (struct dictionary *d,
+ void (*changed) (struct dictionary *, void*),
+ void *data);