Adding Query String Parameters to Table loadData

Question

I am new to ADF/JDeveloper, so hopefully this is a simple question...
I have created an ADF task flow containing a table of fake weather data. This data is loaded using a URL Service Data Control. The URL service takes a zip code as a querystring parameter and returns a CSV of weather data. All of this works fine when I create the data control, test the URL and add the table. However, right now I am hard coding the zip code into my loadData argument (where I submit the zip code).
What I want to do is read a querystring parameter from the JSPX page my task flow resides on and submit that zip code to loaddata in my bindings. When I write the EL that I think should do this (the same EL works when I put it in an outputText box), the task flow fails to load the correct zip code.
I have tried creating a backing bean and loading the data from there, but this doesn't seem to work either. So what is the "ADF way" to do this?
Here are my current bindings from the task flow page definition (see NDValue):
<bindings>
<methodAction id="loadData" RequiresUpdateModel="true" Action="invokeMethod"
MethodName="loadData" IsViewObjectMethod="false"
DataControl="ZipWeatherDC" InstanceName="ZipWeatherDC"
ReturnName="ZipWeatherDC.methodResults.loadData_ZipWeatherDC_loadData_result">
<NamedData NDName="zip"
NDValue="#{param.zipcode}" NDType="java.lang.String"/>
</methodAction>
<tree IterBinding="loadDataIterator" id="Return">
<nodeDefinition DefName="net.hross.adf.weather.model.ZipWeatherDC.loadData_Data">
<AttrNames>
<Item Value="dayOfWeek"/>
<Item Value="hiTemp"/>
<Item Value="lowTemp"/>
<Item Value="precip"/>
<Item Value="sky"/>
<Item Value="zipCode"/>
<Item Value="img"/>
</AttrNames>
</nodeDefinition>
</tree>
</bindings>
Thanks in advance for any advice!
Ross

Answer 1

OK.  I typed the Name manually. But I neglected to hit the tab key twice to arrive at the Value input field.
Screenshot 1
After hitting tab key twice, value field is in focus and 2nd lightening bolt appears.
Gads!  No wonder people mess this up. 
Thanks, David.  I appreciate your clarification. 
Nancy O.