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XML is still huge in corp land. In Healthcare, HL7 is gradually moving to an XML version. SOAP is everywhere, JSON is not. Horses for courses.

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Getting somewhat far afield of the OP, but in healthcare, the bigger trend seems to be a move from HL7v2 past the dumpster fire that was XML-based HL7v3 to JSON-based FHIR.

They'll turn json into a dumpster fire to, it's just tradition at this point.

I think xml with it's great validation and inter-operability is still the best choice for something like HL7 though.

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