Attach a file in a Web Service

Hi all,

I have a question, and I need help to resolve it.

I want to work in a syncronous RFC - WebService integration scenario and I am not sure if it is possible to send a file (pdf, excel, msword,....) within the body of the xml message. I need to send/recive pdf file from a SAP system to another third party system.

It is possible? How?

It is possible to build a RFC which sends/receives files?

It is allowed in SAP XI 3.0 or SAP PI 7.0?

Thanks for all.