How to fetch XML and to test it

Hi to all,

i would like you a help.

I have a function module that is published as web service.

It has an input parameter I_XML type XSTRING.

Since i want to test the function module and i have a file with extension .xml

My issues are:

1) how can i load the XML into function module?

2) anybody could tell me how convert the XML into internal table?

Thanks in advance.

Fabio