{
   'uid' => {
      '1' => ['3','4','5','6'],
      '2' => ['4','3','1','5'],
   },
   'did' => {
      '1' => '2',
      '3' => ['1','2'],
      '4' => ['1','2'],
      '5' => ['1','2'],
      '6' => '1',
   },
}


##</code><code>##

<opt>
  <did 1="2" 6="1">
    <3>1</3>
    <3>2</3>
    <4>1</4>
    <4>2</4>
    <5>1</5>
    <5>2</5>
  </did>
  <uid>
    <1>3</1>
    <1>4</1>
    <1>5</1>
    <1>6</1>
    <2>4</2>
    <2>3</2>
    <2>1</2>
    <2>5</2>
  </uid>
</opt>