Can somebody respond to the question???

I am new to this technology and I was wondering if XI50 could support the following message exchange pattern:

A Client sends a http SOAP request to the device(XI50). This request is transformed into another custom XML format and sent to a back-end service via MQ.
Now the back-end service may send upto 3 XML responses via MQ back to the device(XI50). These responses should be aggregated and sent back as the SOAP response of the original http request. Assume that each of the 3 responses can have a distinct matching rule.

I am aware I have to configure a Multi-protocol Gateway service. But how do I aggregate the three messages?, can the backside MQ Handler handle sequencing etc..As you can see I still a new-bee in this product.

Thanks
zt