[libvirt-users] network comanline to xml

hello, i start a kvm guest with the following comand line: kvm -hda myimage.img -m 1024 -smp 2 \ -net nic -net tap,ifname=tap0,script=no now a plan to start this via libvirt. I have try to set nat via the libvirt-manager but this doesn't connect. So i try to use bridge network via the GUI and get a "non supported" error when i use tap0 as "bridge device". How can i "convert" the "-net nic -net tap,ifname=tap0,script=no" to a valid libvirt-xml file? The following example is also buggy: <interface type='network'> <mac address='52:54:00:46:3e:70'/> <source network='default'/> <target dev='tap0'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'$ </interface> thanks