Check if XML attribute is set?

[wvxvw]

var list:XMLList =
XMLList(<component name="gun" size="0"/> +
<component name="armor"/>);
list.@*.(name() == "size" ? setSize(parent()) : "");
function setSize(value:XML):void
{
    trace("setting size of:", value.@name, "to:", value.@size);
}