ActionScript 3.0 :: Using XML Value As Global For All SWF?

I've imported Excel values through XML file. I can already navigate to any XML value that I want (by trace()), but I want to operate with these values in my applcation. I can read the XML values, but how should I make them to be global, to have access to them and use them anywhere in the timeline, in different moviclips? Easy example of importing XML file and importing some xml value:

ActionScript Code:
stop();
var myXML:XML;
var myLoader:URLLoader = new URLLoader();
myLoader.load(new URLRequest("file.xml"));
myLoader.addEventListener(Event.COMPLETE, processXML);
function processXML(e:Event):void {
myXML = new XML(e.target.data);
var MyVariable = myXML.Data[0]; //for example Data[0] in XML file stores value "0,5"
}

And now, I want MyVariable to be accessed from anywhere in application. In xml file, value stored in Data[0] was '0,5', so now MyVariable is 0,5 and I want to have access to this number. For now it is available only inside this processXML function, how to take MyVariable outside?