Thanks @carl
Yes, the challenge on the Adapter is exactly as you said, *"looking to create a way to write queries to extract data from a database and then push it to an HIE service through an OpenHIM or interoperability layer”. So to look it a bit in steps,
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building queries to access DB and avail it through FHIR compliant API
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Use mediator to pull data using the FHIR endpoint(the adapter)
So what was done in this regard? Can you put links I can look for!