➜  ~ xmllint --xpath //hyperv win11-hyperv-full.xml 
<hyperv mode="passthrough">
      <relaxed state="on"/>
      <vapic state="on"/>
      <spinlocks state="on" retries="12287"/>
      <vpindex state="on"/>
      <runtime state="on"/>
      <synic state="on"/>
      <stimer state="on">
        <direct state="on"/>
      </stimer>
      <reset state="on"/>
      <vendor_id state="on" value="KVM Hv"/>
      <frequencies state="on"/>
      <reenlightenment state="on"/>
      <tlbflush state="on"/>
      <ipi state="on"/>
      <evmcs state="on"/>
      <avic state="on"/>
      <emsr_bitmap state="on"/>
      <xmm_input state="on"/>
    </hyperv>

➜  ~ virsh create win11-hyperv-full.xml            
Domain 'win11' created from win11-hyperv-full.xml

➜  ~ virsh dumpxml win11 |virt-xml-validate -   
Relax-NG validity error : Extra element features in interleave
-:16: element features: Relax-NG validity error : Element domain failed to validate content
- fails to validate