How to find out the descendants of one node that has a nameplace

hello
i got a littile trouble when i try to find out the
descendants of node which has a nameplace,check this sample code
below please.
no matter i try to use the node's local name,name,i still got
a blank.i am confused about that.
do u people know how to solove that? i really want get that
descendants of node with nameplace.
hope u can help me,thx vv much.

though i have a vicarious solution,but i don't want use it
right now,i think there would be exist a direct way.
attach my vicarious solution:
function getDescendants(xml:XML,des:String="*") {
var list:XMLList=xml.descendants("*");
var rlist:XMLList=new XMLList();
for each (var node:XML in list) {
if (node.localName()==des || des=="*") {
rlist+=node;
return rlist;
var xl:XMLList=getDescendants(xx,"b");
trace(xl.length());//output:1
trace(xl[0].toXMLString());//output:<bb:b
xmlns:bb="bb.*"/>
and yes,the final result is what i want,but i don't like its
course.

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