+.IP "\fBjson\fR"
+JSON format as defined in RFC 4627. The output is a sequence of JSON
+objects, each of which corresponds to one table. Each JSON object has
+the following members with the noted values:
+.RS
+.IP "\fBcaption\fR"
+The table's caption. This member is omitted if the table has no
+caption.
+.IP "\fBheadings\fR"
+An array with one element per table column. Each array element is a
+string giving the corresponding column's heading.
+.IP "\fBdata\fR"
+An array with one element per table row. Each element is also an
+array with one element per table column. The elements of this
+second-level array are the cells that constitute the table. Cells
+that represent OVSDB data or data types are expressed in the format
+described in the OVSDB specification; other cells are simply expressed
+as text strings.