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I'm not pretending anything and I hate XML. I would still rather use it than HL7, because it's a hierarchical tree of data and HL7 is not. OP's point is that almost nobody wants to use XML anymore; my point is that almost nobody wants a Ford Model T as their daily driver anymore either, and yet it was still the future, in a certain sense.

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https://en.wikipedia.org/wiki/Billion_laughs_attack https://en.wikipedia.org/wiki/XML_external_entity_attack

XML is so much more than hierarchical data serialization format. In a typical conversation XML generally means "JSON-compatible subset of XML" as if the other parts do not even exist. Like in the meme "Javascript vs Javascript the good parts".

XML never really took off, only the parts that make up "different flavor of JSON".

Do you think FHIR is acceptable?

It feels like a cross between JSON and HL7 to me.

I quite like FHIR. My experience with using it has been that everyone seems to implement it slightly differently, but it does a better job at being human-readable. It was much easier for us and our partners to work with than regular HL7.

Some things were a bit weird. From memory it had big lists of records all mixed together as the implementation of references.

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