Structured Data Capture
Smart Forms is built as a reference implementation of the Structured Data Capture FHIR specification, and is based on R4 FHIR.
The SDC specification provides a set of guidance around the use of Questionnaire and QuestionnaireResponse that support many additional capabilities that provide benefits to providers, patients and other users.
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Before diving into this section, it might be worth reading the usage examples guide in the Components section.