+_notmuch_string_map_iterator_move_to_next (notmuch_string_map_iterator_t *iter);
+
+const char *
+_notmuch_string_map_iterator_key (notmuch_string_map_iterator_t *iterator);
+
+const char *
+_notmuch_string_map_iterator_value (notmuch_string_map_iterator_t *iterator);
+
+void
+_notmuch_string_map_iterator_destroy (notmuch_string_map_iterator_t *iterator);
+
+/* tags.c */
+
+notmuch_tags_t *
+_notmuch_tags_create (const void *ctx, notmuch_string_list_t *list);
+
+/* filenames.c */
+
+/* The notmuch_filenames_t iterates over a notmuch_string_list_t of
+ * file names */
+notmuch_filenames_t *
+_notmuch_filenames_create (const void *ctx,
+ notmuch_string_list_t *list);
+
+/* thread.cc */
+
+notmuch_thread_t *
+_notmuch_thread_create (void *ctx,
+ notmuch_database_t *notmuch,
+ unsigned int seed_doc_id,
+ notmuch_doc_id_set_t *match_set,
+ notmuch_string_list_t *excluded_terms,
+ notmuch_exclude_t omit_exclude,
+ notmuch_sort_t sort);