on the 
<a href="http://wiki.openstack.org/XenServerDevelopment">http://wiki.openstack.org/XenServerDevelopment</a>, in some point , it's mentione "
<a href="http://wiki.openstack.org/XenServer" style="color:rgb(0,0,0);border-top-width:0px;border-right-width:0px;border-bottom-width:1px;border-left-width:0px;border-style:initial;border-color:initial;text-decoration:none;border-bottom-style:dashed;border-bottom-color:rgb(221,221,221);font-family:sans-serif;font-size:14px;line-height:18px;background-color:rgb(255,255,255)">XenServer</a><span style="color:rgb(83,83,83);font-family:sans-serif;font-size:14px;line-height:18px;background-color:rgb(255,255,255)"> requires a nova-compute domU" what is nova-compute domU, and where i can find documentation about it?</span>