Async process

hi,
i have a question. if u have a async process then u send several request and u may or may not receive response immediately.
Then, how can soa infrastructure relate - whenever the response does come "Which response is meant for which request" ? How does it relate correct response to the corresponding request ?
is it taken care by soa infra automatically ? or does developer need to do specific in bpel to correlate ? any good doc on this requirement appreciated.
thx

quick amendment to the previous post - in case your service does NOT support ws-addressing you can use the correlation set feature in BPEL (content based correlation). Mediator (in 11g) sets its own correlation id into the request.

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