+Presents the results in either JSON, S-Expressions, newline character
+separated plain-text (default), or null character separated plain-text
+(compatible with \fBxargs\fR(1) -0 option where available).
+.RE
+
+.RS 4
+.TP 4
+.BR \-\-format-version=N
+
+Use the specified structured output format version. This is intended
+for programs that invoke \fBnotmuch\fR(1) internally. If omitted, the
+latest supported version will be used.