[flexcoders] e4x Filtering Success

[AJC2357]

(partially...)

I was able to filter through e4x via mx:XML and the dataProvider as follows...

<mx:XML id="data" source="sep.xml" format="e4x"/>
<mx:PieChart width="100%" height="100%" dataProvider="{data.Location.(region == 
'Asia' )}">

How can I add an additional filter argument from here?  Using the && technique 
gave me error that "entity name must immediately follow &"

I want to filter something like: region = Asia AND GDP/capita = 10000  

Thanks!