var iterator = document.evaluate('//xpath/li[*]', document, null, XPathResult.UNORDERED_NODE_ITERATOR_TYPE, null);

try {
  var thisNode = iterator.iterateNext();
  var arrayList = [];

  while (thisNode) {
    arrayList.push(thisNode.textContent);
    thisNode = iterator.iterateNext();
  }

  for (var i = 0; i < arrayList.length; i++) {
    console.log(arrayList[i]);
  }
} catch (e) {
  dump('Error' + e);
}
arrayList