var xmlString = '<?xml version="1.0" encoding="ISO-8859-1"?><foo><bar world="hello" id="1"><subbar name="item1" id="2">          </subbar>  </bar>      <bar world="bye" id="3">          <subbar name="item2" id="4">          </subbar>      </bar>     </foo>';

var parser = new DOMParser();

​

var dom = parser.parseFromString(xmlString, "text/xml");

//alert(dom+ document.evaluate);

var iterator = dom.evaluate('/foo/bar[@world=\'hello\']/child::*/attribute::name    |/foo/bar[@world=\'hello\']/child::*/attribute::id', dom, null, XPathResult.UNORDERED_NODE_ITERATOR_TYPE, null );

​

try {  

  var thisNode = iterator.iterateNext();  

  var resultText = '';

  while (thisNode) {  

    resultText += thisNode.textContent+'\n' ;  

    thisNode = iterator.iterateNext();  

  }   

  alert(resultText);

}catch (e) {  

  alert( 'Error: Document tree modified during iteration ' + e );  

}  

​