E4X descendant-access (..) not working in simple case. Why?

Question

I have a fairly simple case where I'm trying to use E4X to access some grandchildren in my xml file. The data is coming from an HTTPService POST, and I have the resultformat set to E4X. Are there any other things I should look out for? I've worked with E4X a bunch in AS3 and have never had a problem before.
I'm trying to get the Exercise tags in a for loop
for each (var node:XML in xml..Exercise) {
but xml..Exercise yields an empty XMLList.
Here is my sample xml:
<StudentProfile UserID="22" RoleID="1" Username="jsmith" FirstName="John" LastName="Smith" Email="" StudentID="" LastLogin="">
<EnrolledSection CourseID="9" CourseName="Test Class" SectionID="14" SectionName="A">
<Preferences/>
<Exercises>
<Exercise Exercise_id="1" Status="1" Enabled="true" IPValid="true" TimeValid="true" PasswordRequired="false"/>
<Exercise Exercise_id="2" Status="0" Enabled="true" IPValid="true" TimeValid="true" PasswordRequired="false"/>
<Exercise Exercise_id="3" Status="0" Enabled="true" IPValid="true" TimeValid="true" PasswordRequired="false"/>
<Exercise Exercise_id="4" Status="0" Enabled="true" IPValid="true" TimeValid="true" PasswordRequired="false"/>
</Exercises>
</EnrolledSection>
</StudentProfile>

Answer 1

Hi,
Using your sample XML,
var exercises:XMLList = xml..Exercise;
for each (var node:XML in exercises) {
    trace(node.@Exercise_id);
Produces the output;
1
2
3
4
So that means node is an Excerise node. SOmetimes Flash Builder does not actually show the "node" toString() in the consol correctly.
traceing exercises yeilds the correct XMLList
<Exercise Exercise_id="1" Status="1" Enabled="true" IPValid="true" TimeValid="true" PasswordRequired="false"/>
<Exercise Exercise_id="2" Status="0" Enabled="true" IPValid="true" TimeValid="true" PasswordRequired="false"/>
<Exercise Exercise_id="3" Status="0" Enabled="true" IPValid="true" TimeValid="true" PasswordRequired="false"/>
<Exercise Exercise_id="4" Status="0" Enabled="true" IPValid="true" TimeValid="true" PasswordRequired="false"/
Mike