Need udf to get the filename from the input payload

Hi Experts,

I had a requirement where i want the file name as present in the payload.for example i am having the structure as follows

mt_input

Name

id

here if i am having the name as santosh in the input payload i want the file name as santosh.xml so the file naaame will be dynamically chaged as per that i need the file name.Please suggest me. similarly i need the udf to get the header name as file name i.e mt_input.xml this will be in another scenario.

Thanks

Giridhar