Our enterprise consists of multiple sources exchanging data with each other via a central HUB or bridge service model. There is one requestor and multiple responders at any given time. The central HUB service takes the (bundle) response from all responding sources and aggregates them into one bundle response and passes back to the requestor.  While doing this aggregation, the central HUB service takes the response bundle from each source and puts it into another bundle (parent bundle). For example, we get a bundle of bundles or a nested bundle.

Detailed documents are attached which represent this scenario along with some possible solutions that speak to the creation of the response (bundle). We are submitting our case to the FHIR Infrastructure Work Group and are seeking expertise and assistance with uncovering the best solution for this implementation.