Now I want to add some args about TPM  to domain's XML,so I can start a domain 
by virt-manager or other virsh command,and then ,I would like to use sVIrt 
security context to label vTPM and correspondingVM,But I do not know how to get 
these XML  args in libvirt.
the key problem is that how can i get and recognize these args!!!
related XML content :

    <qemu:arg value='-enable-kvm'/>
    <qemu:arg value='-drive'/>
    <qemu:arg value='-device'/>
    <qemu:arg value='tpm-tis,tpmdev=tpm-tpm0,id=tpm0'/>
    <qemu:arg value='-tpmdev'/>
    <qemu:arg value='libtpms,id=tpm-tpm0,nvram=nvram0-0-0,startup=clear'/>
    <qemu:arg value='-bios'/>
    <qemu:arg value='/root/xenSeabios/out/bios.bin'/>
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