Clarification in Payment Format in R12

Hi All,

I have a requirement to generate a payment format report through the Payment Document Setup in R12.

I created XML Template, Payment Format, Payment Document, Payment Process Profile in Payments Setup Administrator responsibility. For RTF Template, I used Standard Data Definition: Oracle Payments Funds Disbursement Payment Instruction Extract 1.0

With this, I am able to generate the payment format report when I do payment in AP Invoice. But now my question is, I want to know how to get the xml source code of the above said Data Definition, and also please tell me how to customize the xml data to include my own data fields to show in the report as per the requirement.