How to bind to local xml file?

I have a local XML file referenced in my Declarations tag:
<fx:Declarations>
<fx:XML id="myXMLdata" source="assets/names.xml" />
</fx:Declarations>
I previously had a proof of concept version working with the XML defined in my MXML with a bindable tag:
[Bindable]
public var names : XML= <root>
etc., etc.
I need to place the xml in a separate local file so that changes to the file will persist.
How do I do this and bind to it?
thanks
MCE

http://www.adobe.com/devnet/air/flex/quickstart/xml_prefs.html - This should help you, i guess.
In short,
private function saveXML():void
personXML.firstName = fName_txti.text;
personXML.lastName = lName_txti.text;
var newXMLStr:String = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" + personXML.toXMLString();
var fs:FileStream = new FileStream();
fs.open(file, FileMode.WRITE);
fs.writeUTFBytes(newXMLStr);
fs.close();
This function can be the eventHandler function for, say an XML change event etc.
Hope this helps,
Balakrishnan V

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