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by nradov 2419 days ago
Unfortunately due to the way the HL7 web site is structured there's no way to give a direct link. Go to the Normative Edition, Foundation, Data Types, Basic Types.

http://www.hl7.org/implement/standards/product_brief.cfm?pro...

The FHIR data model is a little simpler to allow for easier implementation. In the vast majority of real world healthcare use cases it works well. But from a modeling standpoint if you need to cover odd edge cases it sometimes helps to look back at the old RIM.