[Vlasenko Fedor]

<properties>
  <prop id="31" data="8345783" />
  <prop id="27" data="9156159" />
  <prop id="82" data="0213545" />
</properties>
<script>
  var props = document.querySelectorAll('properties prop');
  var dataArr = [];
  for (var i = 0; i < props.length; i++) {
    dataArr.push([props[i].id, props[i].getAttribute('data')]);
  }
  console.log(dataArr);
</script>

примерно так