Prior to FHIR, there was actually an XML-based HL7 v3 as well. Mercifully, it collapsed under the weight of its own spec and rarely shows up in the wild these d

Prior to FHIR, there was actually an XML-based HL7 v3 as well. Mercifully, it collapsed under the weight of its own spec and rarely shows up in the wild these days. CDA still survives, but it's much easier to work with and being slowly made obsolete by FHIR resources.