[libvirt-users] domain schema fails to validate sysinfo element

I'm puzzled why virt-xml-checker rejects minimal config xml if it includes sysinfo element: <domain type='kvm'> <name>example</name> <sysinfo> </sysinfo> </domain> with the following error: Relax-NG validity error : Extra element sysinfo in interleave minimal.xml:3: element sysinfo: Relax-NG validity error : Element domain failed to validate content minimal.xml fails to validate I tried xmllint it gives the same output