Sorting XMLListCollection by nested elements

Question

I've been sorting XML files using an XMLListCollection when I have an XML with the following structure:
<products>
     <product id="1">
          <field1>value</field1>
          <field2>value</field2>
          <field3>value</field3>
     </product>
     <product id="2">
          <field1>value</field1>
          <field2>value</field2>
          <field3>value</field3>
     </product>
</products>
by using an XMLListCollection as follows:
var mySort:sort = new Sort();
var xlcProducts:XMLListCollection = new XMLListCollection();
mySort.fields = [new SortField("field3"), new SortField("field2")]
xlcProducts.source = dataSet.elements("product");
xlcProducts.sort = mySort;
xlcProducts.refresh();
Now I'm dealing with a more complicated XML that follows this structure:
<products>
     <product>
          <productID>607</productID>
          <productName>ADS1000</productName>
          <features>
               <featureData>
                    <featureName>feature1</featureName>
                    <featureValue>value1</featureValue>
               </featureData>
               <featureData>
                    <featureName>feature2</featureName>
                    <featureValue>value2</featureValue>
               </featureData>
               <featureData>
                    <featureName>feature3</featureName>
                    <featureValue>value3</featureValue>
               </featureData>
          </features>
     </product>
     <product>
          <productID>607</productID>
          <productName>ADS1000</productName>
          <features>
               <featureData>
                    <featureName>feature1</featureName>
                    <featureValue>value1</featureValue>
               </featureData>
               <featureData>
                    <featureName>feature2</featureName>
                    <featureValue>value2</featureValue>
               </featureData>
               <featureData>
                    <featureName>feature3</featureName>
                    <featureValue>value3</featureValue>
               </featureData>
          </features>
     </product>
</products>
My problem here is that the same approach doesn't seem to work, when I create the mySort object to assign to the XMLListCollection I can't seen to be able to point it to a field that is not on the top level of the XML's children. Here, I need to sort the XML by featureValue for two different features (which will change at different points in time)
I've tried to do stuff like this to no avail:
mySort.fields = [new SortField("features.featureData.(featureName == \"feature3\").featureValue"), new SortField("features.featureData.(featureName == \"feature2\").featureValue")]
I'm assuming I can't have XML queries in the SortField's name, but nothing else I've tried has worked.

Answer 1

Yeah, I actually started working on that approach earlier today.
Thanks for the confirmation.