Prepopulate repeated grid using http service

I am trying to pre populate a repeated grid using the http service.  The http service will return an xml and i am trying to map each of the element to a column with in a grid.  Currently only the first row of the grid is getting populated.  I did some google search but couldn't find a workable solution.  Could you please provide some guidance in tackling this issue?

<medications>
<dose>11</dose>
<form>tablet</form>
<medication>Lisinopril 20 MG Oral Tablet</medication>
<route>oral</route>
<status>active</status>
</medications>
<medications>
<dose>11</dose>
<form>tablet</form>
<medication>Furosemide 40 MG Oral Tablet</medication>
<route>oral</route>
<status>active</status>
</medications>

Unfortunately, populating repeated grids from the result of a single call to a service isn't currently supported by Form Builder. This however is one of our top RFEs, so we'll hopefully get to it soon. For reference, I've put below a link to the RFE, and added a +1 from you.

https://github.com/orbeon/orbeon-forms/issues/1298

Alex