<interfaces xmlns="urn:ietf:params:xml:ns:yang:ietf-interfaces">
  <interface>
    <name>eth0</name>
    <type xmlns:ift="urn:ietf:params:xml:ns:yang:iana-if-type">ift:ethernetCsmacd</type>
  </interface>
  <interface>
    <name>eth1</name>
    <type xmlns:ift="urn:ietf:params:xml:ns:yang:iana-if-type">ift:ethernetCsmacd</type>
  </interface>
</interfaces>
<root3 xmlns="urn:sm-main">
  <my-list>
    <name>list item 1</name>
    <things xmlns="urn:sm-ext">
      <name>eth0</name>
      <attribute>1</attribute>
    </things>
  </my-list>
</root3>