BPM with variable number of initial receive steps

Hi guys,
I have a scenario where an external Web Server sends XML messages over HTTP to XI.
It may be the case that the number of messages that concern a single request is one, two or three.
Messages are correlated through a unique key. 
Since this is HTTP communication I do not need neither sender agreements nor sender communication channels.
How could this be implemented with BPM ?
Of course the sender system should specify the complete URL name when submitting the request(s).
Evaggelos

Configure ur BPM as payload dependent or message-dependent. In payload dependent, u will have to specify the no of messages. In message dependent, u ll have to specify the indicator in message indicating the end of messages.
http://help.sap.com/saphelp_nw04/helpdata/en/08/16163ff8519a06e10000000a114084/content.htm
Regards,
Prateek

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