title: Query data from Google Spreadsheet generated by Form
body: <p>Currently we're having a request to integrate the Google Form functionality into our system. I'd done some searching on the web, and found that there's no way we can change the post processing of a Google Form unless we do some heavy customization using 3rd party tools.</p>
  
  <p>Thus i have an idea that, when someone fill in the Google Form, he/she will need to fill in a 'user id' in the form. This will be collected as a field in the Google Spreadsheet generated by the form.</p>
  
  <p>In my back end application, i would query the spreadsheet and look for the user id field input by the user. Then i would be able to know whether he/she completed the form or not.</p>
  
  <p>I'm trying to look at the Google Docs API for the spreadsheet and found that there are list-based feed and cell-based feed but i'm not sure which one can achieve what i want to do. Anyone has experience in this can shed a light?</p>
  
  <p>Thank you</p>