libvirt users - Mar 2010 - Libvirt and openvz?

I just recently started using openvz and I'm trying to use libvirt/virsh
with it.  

I followed the directions on page: http://libvirt.org/drvopenvz.html

But I get an error trying to run define with the example config file:

 virsh define virt.conf
error: Failed to define domain from virt.conf
error: unknown OS type exe

I'm using libvirt 0.7.2.

Does anyone have more example configuration files or other setup
instructions?

Does Libvirt allow you to specify other resource limits and controls that
openvz has - like vzctl set --devnodes device:rw or vzctl set kmemsize?

Thanks,
Tom