BizTalk 2006 R2 with ESB guidance

Hi,

I’m new to Biztalk and ESB guidance,

1 > Can anyone explain to me or have any examples of any itinerary headers that is being routed to multiple service providers?

2> When an itinerary header is validated, what is it validated against (is it validated against WSDL??, is it a generaic WSDL..any examples would be appreciated)

3> When a response is derived from the endpoint (Service Provider), how is the location for the response determined when there is no location specified in the header for the response?

Thank you all in advance for any responses, much appreciated.

Kind regards,

Yogi