...
<arr>
  <elem rp="rstring1">
    <mod>mstring1</mod>
    <subarr>
      <subelem>...</subelem>
      <subelem>...</subelem>
    </subarr>
  </elem>
  <elem rp="rstring2">
    <mod>mstring2</mod>
    <subarr>
      <subelem>...</subelem>
      <subelem>...</subelem>
    </subarr>
  </elem>
  ...
</arr>
...