+.IP "\fBOXM-OpenFlow14\fR"
+The standard OXM (OpenFlow Extensible Match) flow format in OpenFlow
+1.4. OpenFlow 1.4 is not yet well supported; in particular, the
+implementation is unsafe, such that sending an unsupported message in
+OpenFlow 1.4 to \fBovs\-vswitchd\fR can cause it to crash.