-If I<BlockDeviceFormat> is set to B<target>, then the device names will be the ones
-in the I<target> node for the device in the XML definition of the domain. The
-default is B<target>. This is the behavior before adding the option.
-
-If I<BlockDeviceFormat> is set to B<source>, then the device names will be the ones
-in the I<source> node for the device in the XML definition of the domain.