+/*
+ * Tagging priorities.
+ * Lower numbers indicate higher importance.
+ */
+#define TAG_MANUAL 1 /* Set with a .Tg macro. */
+#define TAG_STRONG 2 /* Good automatic tagging. */
+#define TAG_WEAK (INT_MAX - 2) /* Dubious automatic tagging. */
+#define TAG_FALLBACK (INT_MAX - 1) /* Tag only used if unique. */
+#define TAG_DELETE (INT_MAX) /* Tag not used at all. */