[libvirt] Libvirt audio xml format

[Simon Lambourn <simon_lambourn btconnect com>]

Hi, excuse the possible dumb question from a new KVM/Libvirt user - I'm 
very impressed overall but struggling to work out how to define an audio 
device in the libvirt xml.   I have a virtualised windows XP up & 
running, now want to add an audio device.   I can see how to do it in 
kvm and I believe audio devices are now supported in libvirt, but could 
not find documentation on how to write the xml.   

System is Ubuntu 8.10 on AMD64.
Thanks in anticipation.