+ Presents the results in either JSON, S-Expressions, newline
+ character separated plain-text (default), or null character
+ separated plain-text (compatible with <b>xargs</b>(1) -0 option where
+ available).
+
+ <b>--format-version=N</b>
+
+ Use the specified structured output format version. This is
+ intended for programs that invoke <a href='../notmuch-1/'>notmuch</a>(1) internally. If
+ omitted, the latest supported version will be used.