How to generate one WSDL for Multiple Interfaces?

Hi,

I am working on XI Integration. I am using following approach for communication :

My Application ---> XI using SOAP Protocol and

XI ---> SAP R/3(CE 8) using RFC.

I have created two different Message Interfaces in one Integration Scenario.

My doubts are :

1. Do I need to create two different Receiver Determination,Interface Determination and Receiver Agreement for each of these interfaces in Integration Builder:Configuration or the above mentioned objects can be the same for both the Interfaces.?

2.Is there any way possible that I can generate one WSDL file for all the interfaces?

Thanks for your suggestions.

Regards,

Vikas Khandpur