rp.gs.com> Jon, Would you try with this patch? diff -c libvirt-0.6.3/docs/schemas/domain.rng libvirt-0.6.3.updateschema/docs/schemas/domain.rng *** libvirt-0.6.3/docs/schemas/domain.rng 2010-07-23 12:44:45.000000000 -0400 --- libvirt-0.6.3.updateschema/docs/schemas/domain.rng 2010-10-05 14:17:16.700561725 -0400 *************** *** 150,155 **** --- 150,156 ---- </attribute> <attribute name="machine"> <choice> + <value>rhel5.4.0</value> <value>xenfv</value> <value>pc</value> <value>isapc</value> -- James M. Leddy Technical Account Manager Red Hat Inc.