-void dataset_set_callback (struct dataset *, void (*cb) (void *), void *);
-
-void dataset_set_default_syntax_encoding (struct dataset *, const char *);
-const char *dataset_get_default_syntax_encoding (const struct dataset *);
+unsigned int dataset_seqno (const struct dataset *);
+
+struct dataset_callbacks
+ {
+ /* Called whenever a procedure completes execution or whenever the
+ dictionary within the dataset is modified (though not when it is
+ replaced by a new dictionary). */
+ void (*changed) (void *aux);
+
+ /* Called whenever a transformation is added or removed. NON_EMPTY is true
+ if after the change there is at least one transformation, false if there
+ are no transformations. */
+ void (*transformations_changed) (bool non_empty, void *aux);
+ };
+
+void dataset_set_callbacks (struct dataset *, const struct dataset_callbacks *,
+ void *aux);
+
+/* Dataset GUI window display status. */
+enum dataset_display
+ {
+ DATASET_ASIS, /* Current state unchanged. */
+ DATASET_FRONT, /* Display and raise to top. */
+ DATASET_MINIMIZED, /* Display as icon. */
+ DATASET_HIDDEN /* Do not display. */
+ };
+enum dataset_display dataset_get_display (const struct dataset *);
+void dataset_set_display (struct dataset *, enum dataset_display);