Chapter 03 · Foundations · Beat 1 — The cells and the graph
Datatypes are the cells. References are the graph.
Last chapter we cracked open a resource and named its six anatomical parts. Inside those parts lives another layer — the datatypes. By the end of this chapter you can read FHIR's five workhorse datatypes, wire resources into a graph with References, and dodge the two classic traps that quietly corrupt real systems.
What you will be able to do
The five datatypes — the spine of FHIR
References — the graph that connects them
The UCUM and MRN gotchas
Sections
The five datatypes
Reference and the graph
Encounter and Observation
Identity and units
