How to join the results from 2 webservices using BPEL?Architecture question

Hi,
I am new to BPEL. BPEL process calls two webservices, which return complex results. I need to process the results from 2 webservices using BPEL .The result will be a complex xml, join/merge of previous results.
What is the best practice to do it with BPEL?
I see three ways:
1.To do the processing (join/ merge) inside the BPEL process itself and return complex xml.
2.Develop auxiliary webservice in java. Auxiliary webservice will do the processing (join/merge). Call this webservice from BPEL process.
3.Do a plain concatenation of the two XMLs in BPEL and forward it to the frontend. Frontend then will do all the logic on its side
Thanks,
Boris

you could process the XMLs one at a time, and use XSL transformations to process the payload to a target schema.
Activity 1:
output from webservice1 -> transform 1 -> partial XML (of target schema)
Activity 2:
output from webservice2 -> transform 2 -> completed XML (of target schema)
Regards,
Shanmu.

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