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Dear Carlos,
I agree that FHIR is a top candidate technology to address this on the
long term. Personally it is also my recommendation.
However we have to accept the fact that not all regions are able to
implement it on the short term.
e.g. Austria has CDA installed with millions of documents per month and
millions of € invested. No chance to migrate within the next few years.
EU cross border (CEF DSI) is also heavily into CDA.
Whatever we recommend, we must also consider feasible migration paths
and sufficent timeframes for an orderly move to these new technologies.
One other observation:
10 years ago only very few knew CDA in Austria. Now CDA still is not
rolled out completely. FHIR pops in. Everything changes …  Pain!! Do
we throw away everything CDA?
What will be the appropriate technology 5 years from now? We therefore
want to make sure that the data still travels, no matter which
technology is used far behind the screen?
All the best,
greetings from Vienna,