I have found David Hay's posts on the HL7 FHIR Questionnaire resource indispensable. One thing I find especially exciting is how with FHIR you can build a server API that supports XML and JSON, completely within the standard, then work with whichever is appropriate. You can also build a simple application that, for instance, publishes a read-only Questionnaire, and if at some time in the future you need to persist survey responses, the FHIR resource already supports that. It's a particularly agile standard in this respect.
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