Tony: There is some work I would like to share on implementing FHIR resource profiles and detailed models as supplemental XML schemas. It sounds like this might be an opportunity to drill down on this area of specification and testing since there are many ways to construct FHIR resource payloads and for exchanges there needs to be a method of unification. The main focus of this technique is in the validation operation.
I will be sharing research and experimentation on using supplemental XML schemas to precisely define FHIR Resources using the example of Blood Pressure Observation. It is also possible that these schemas can be used as input to transformation tools to define precise sources or targets.
Recorded at the 2014-01-20 AID meeting during the HL7 WGM in San Antonio. See wiki.hl7.org/index.php?title=AID_201401_Agenda for minutes of the meeting.