You can use the URLLoader class to load XML data from a URL. To use the following code in your applications, replace the XML_URL value in the example with a valid URL:

var myXML:XML = new XML();
var XML_URL:String = "http://www.example.com/Sample3.xml";
var myXMLURL:URLRequest = new URLRequest(XML_URL);
var myLoader:URLLoader = new URLLoader(myXMLURL);
myLoader.addEventListener("complete", xmlLoaded);

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

You can also use the XMLSocket class to set up an asynchronous XML socket connection with a server. For more information, see the Flex ActionScript Language Reference.