[flexcoders] refer to dynamic XML elements?

[Paul Hastings]

i have an XML response from a server that has a gazillion elements in it where 
i 
need to use a few of these. the required element names are defined elsewhere & 
read in at run time. the XML response is something along the lines of:

<gml:featureMembers>
        <topp:runoffdatapoints gml:id="runoffdatapoints.1">
                <topp:UPSTREAMAREASQKM>20.8503</topp:UPSTREAMAREASQKM>
                <topp:ID>13469</topp:ID>
                <topp:QMCUBED>9.8567</topp:QMCUBED>
        </topp:runoffdatapoints>
<<gml:featureMembers>

the namespaces are all defined ok & work fine if used statically.

for each (x in result.gml::featureMembers.topp::runoffdatapoints) {
        id=x.topp::ID; // works just fine
}

but i'm having a brain freeze trying to understand how to refer to the required 
elements dynamically. like

var runoffIDField:String="topp::ID";

for each (x in result.gml::featureMembers.topp::runoffdatapoints) {
        id=x[runoffIDField]; // nope
        id=x.child(runoffIDField); // ditto     
}

i guess the namespace is playing havoc w/this.

anyone have any ideas or references?

thanks.