-_notmuch_thread_add_tag (notmuch_thread_t *thread, const char *tag);
-
-void
-_notmuch_thread_set_subject (notmuch_thread_t *thread, const char *subject);
-
-const char *
-_notmuch_thread_get_subject (notmuch_thread_t *thread);
+_notmuch_thread_add_message (notmuch_thread_t *thread,
+ notmuch_message_t *message);