gistfile1.as

import flash.events.Event; 
import flash.net.URLLoader; 

var XML_URL:String = "http://yourdomainwithxml/";
var myLoader:URLLoader;
var myXML:XML = new XML();

function xmlLoaded(event:Event):void 
{ 
    myXML = XML(myLoader.data);
    trace("Data loaded.");
}

function load_external_xml_from_url(url:String)
{
  myLoader = new URLLoader(new URLRequest(url));
  myLoader.addEventListener(Event.COMPLETE, xmlLoaded);
}

function add_field_to_form(tf:TextField)
{
  this.addChild(tf);
}

function create_field_with_text(text:String)
{
  var tf = new TextField();
  tf.text = text;
  return tf;
}

//load_external_xml_from_url(XML_URL);
myXML.onLoad = function(success) {
  if (success) {
    for each (var specialization in myXML) 
    {
      for each (var doctor in specialization)
      {
        add_field_to_form(create_field_with_text(doctor.name));
        add_field_to_form(create_field_with_text(doctor.office_number));
      }
    }
  }
}

myXML.load(XML_URL);