libvirt/tests/domainsnapshotxml2xmlin/disk_snapshot.xml

<domainsnapshot>
  <name>my snap name</name>
  <description>!@#$%^</description>
  <disks>
    <disk name='/dev/HostVG/QEMUGuest1'/>
    <disk name='hdb' snapshot='no'/>
    <disk name='hdc' snapshot='internal'/>
    <disk name='hdd' snapshot='external'>
      <source/>
      <driver type='qed'/>
    </disk>
    <disk name='hde' snapshot='external'>
      <source file='/path/to/new'/>
    </disk>
    <disk name='hde' snapshot='external' type='file'>
      <source file='/path/to/new2'/>
    </disk>
    <disk name='hdf' snapshot='external' type='block'>
      <source dev='/path/to/new3'/>
    </disk>
    <disk name='hdg' snapshot='external' type='network'>
      <source protocol='gluster' name='volume/path'>
        <host name='host' port='1234'/>
      </source>
    </disk>
    <disk name='hdh' snapshot='external' type='network'>
      <source protocol='rbd' name='vol/name'>
        <host name='host' port='1234'/>
        <host name='host2' port='1234' transport='rdma'/>
        <host name='host3' port='1234'/>
      </source>
    </disk>
  </disks>
</domainsnapshot>