Best way to read data into a pdf form on the web?

Use XDP. Which is the native data format for XFA forms. You can see the exact format that needs to be returned to the form by opening it in Acrobat, filling out the form with test data, and exporting the form data to XDP.

Although, FDF should still work. The trick is to get the names right. Use the same method as outlined above to export the form data to FDF. Except, use the JavaScript submitForm function. Run it from the console window. The resulting FDF will show the correct field names. Be sure to export as UTF-8. XFA forms like to use Unicode names.

Hi Thomp,
Thanks for your response. I'm new to LiveCycle and not sure how to export to xml or fdf. I have a form with fields, how do I export to get the correct syntax for the fields names?
Thanks so much!
-pbarnet

Look on the Acrobat "Form -> manage form data -> export data". This displays the SaveAs dialog. Select XDP as the output format. Then do this again with FDF as the output format. This will give you a good idea of the differences.