[libvirt-users] manipulation extra features which hypervisors support

Hello everybody, I am wondering if libvirt community implement features specefic to only one supported hypervisor? I am trying to set the host name and DNS from within the libvirt xml file in user mode network option (SLiRP). Right now I am using the <qemu:commandline>. My concern is if I want to use Xen or other hypervisors, how I should do the same. To be honest, I have not used any other hypervisor, except QEMU yet, I am trying to write a code which can be used for any hypervisor libvirt supports, though. And I am not even sure if it is possible to set DNS address and so on the way they are settable in QEMU. Therefore, I was thinking if there is any standard xml element in <interface> which I may use to solve my problem (setting dns, host name , and so on...) with. On the IRC channel I received a reply that this feature has not been implemented yet, and you are going to support it soon. I am interested to contribute and join the community to imlement this feature if possible. Appreciate pointing me into right direction and thank you in advance. Zamani