XML :: How To Access Nodes In Flex

A web service return to my flex3 client this custom exception:
<SOAP-ENV:Fault xmlns:ro="urn:Gov2gLibrary" xmlns:SOAP-ENV="[URL]" xmlns:xsd="[URL]" xmlns:xsi="[URL]" xmlns:HNS="[URL]" xmlns:SOAP-ENC="[URL]" xmlns:v1="[URL]">
<faultcode>E2gError</faultcode>
<faultstring>abc</faultstring>
<detail><HNS:ROException>
[Code] .....

This is obviously a part of the FaultEvent object I get when the remote call fail, so I'm trying to access "T2gMsg" subnode values like this:
protected function onFaultEvent(e:FaultEvent):void {
var obj:Object = e.fault;
var err:XMLList = obj.element.detail.children()[0].children();
// now I have in err the "Messages" list, subnode of ROException,
// so I should cycle to read one message at time:
for each (var x:XML in err.children()) {
//?
}

How to read ID, Severity etc values. I think something like "x.ID" should work but it's not, while x.child("ID") or x.elements("ID") return null. What can I do?