ex2.xml

<logical-devices xmlns="urn:example:logical-devices">
  <logical-device>
    <name>vrtrA</name>
    <root>
      <interfaces
          xmlns="urn:ietf:params:xml:ns:yang:ietf-interfaces">
        <interface>
          <name>eth0</name>
            <ipv6 xmlns="urn:ietf:params:xml:ns:yang:ietf-ip">
              <enabled>true</enabled>
              ...
            </ipv6>
          ...
        </interface>
      </interfaces>
      <system xmlns="urn:ietf:params:xml:ns:yang:ietf-system">
        ...
      </system>
    </root>
  </logical-device>
  <logical-device>
    <name>vrtrB</name>
    <root>
      <interfaces
          xmlns="urn:ietf:params:xml:ns:yang:ietf-interfaces">
        <interface>
          <name>eth0</name>
            <ipv6 xmlns="urn:ietf:params:xml:ns:yang:ietf-ip">
              <enabled>true</enabled>
              ...
            </ipv6>
          ...
        </interface>
      </interfaces>
      <system xmlns="urn:ietf:params:xml:ns:yang:ietf-system">
        ...
      </system>
    </root>
  </logical-device>
</logical-devices>