+ does not support expansion on repeatitive argument
+ (e.g. ovs-dpctl show [dp...]).
+
+ only support matching on long options, and only in the format
+ (--option [arg], i.e. should not use --option=[arg]).
+
+ovs-vsctl-bashcomp
+-------------------
+
+ ovs-vsctl-bashcomp.bash adds bash command-line completion support
+ for ovs-vsctl command.
+
+ Features:
+ ---------
+
+ display available completion and complete on user input for
+ global/local options, command, and argument.
+
+ query database and expand keywords like 'table/record/column/key'
+ to available completions.
+
+ deal with argument relations like 'one and more', 'zero or one'.
+
+ complete multiple ovs-vsctl commands cascaded via '--'.
+
+ Limitations:
+ ------------
+
+ completion of very long ovs-vsctl command can take up to several
+ seconds.