typedef void replace_source_callback (struct casereader *);
typedef void replace_dictionary_callback (struct dictionary *);
typedef void replace_source_callback (struct casereader *);
typedef void replace_dictionary_callback (struct dictionary *);
void proc_discard_active_file (struct dataset *);
void proc_set_active_file (struct dataset *,
struct casereader *, struct dictionary *);
void proc_discard_active_file (struct dataset *);
void proc_set_active_file (struct dataset *,
struct casereader *, struct dictionary *);