(vm (name 'pvtest')(memory 420)(maxmem 420)(vcpus 2)\
(uuid '596a5d21-71f4-8fb2-e068-e2386a5c413e')(bootloader '/usr/bin/pygrub')\
(bootloader_args '-q')(on_poweroff 'destroy')(on_reboot 'destroy')\
(on_crash 'destroy')(image (linux (args 'xenfb.video=8,1280,1024')))\
(localtime 0)\
(device (vbd (dev 'xvda')(uname 'file:/root/some.img')(mode 'w'))))\