[Libvirt-cim] Query on Pointing Device.

What will happen when the input tag of the xml has the following format ? <input type != 'mouse/tablet' bus != 'xen/usb/ps2'/> For ein on Xen_PointingDevice Should the caption be "Unknown bus Unknown device type" ?? Though I tried creating a guest with invalid values in the input tags using the xml file, the guest was always created with the <input type='mouse' bus='xen'/> tag when I saw the dumpxml of the guest. Is there a way to supply invalid values to the input tag ? Thanks and Regards, Deepti.