I definitely do. The status quo in enterprise is to write to a relational model, then broadcast events based on those changes. In effect, the events are projections of the relational data, which in my mind is putting the cart before the horse. This is a flavour of CQRS, and is considered a stepping stone in migrating to an Event Sourced system, rather than the end result.
Greg Young talks about it during this talk.
I didn't know HL7 was message based, I'll have to read up on it more, thanks for that!
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