...
arr => {
  elem => [
    {
      mod => 'mstring1',
      rp  => 'rstring1',
      subarr => {
        subelem => [
          {...}, {...}, ...
        ]
      }
    },
    {
      mod => 'mstring2',
      rp  => 'rstring2',
      subarr => {
        subelem => [
          {...}, {...}, ...
        ]
      }
    },
}
...    

##</code><code>##

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

##</code><code>##

...
<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>
...