* this. New (required) map fields can be added without increasing
* this.
*/
-#define NOTMUCH_FORMAT_CUR 1
+#define NOTMUCH_FORMAT_CUR 2
/* The minimum supported structured output format version. Requests
* for format versions below this will return an error. */
#define NOTMUCH_FORMAT_MIN 1
+/* The minimum non-deprecated structured output format version.
+ * Requests for format versions below this will print a stern warning.
+ * Must be between NOTMUCH_FORMAT_MIN and NOTMUCH_FORMAT_CUR,
+ * inclusive.
+ */
+#define NOTMUCH_FORMAT_MIN_ACTIVE 1
/* The output format version requested by the caller on the command
* line. If no format version is requested, this will be set to