Fig. 1: Architectural layers.

Overview of the conceptual architecture for SQL on FHIR. The data layer represents FHIR data sources, including FHIR servers, NDJSON files, and FHIR data held within databases. The view layer uses view definitions to define table-like views of the data, and uses view runners to execute these definitions. The analytics layer consumes the tabular data produced by the views as part of analysis tasks. This diagram is reproduced with permission from the SQL on FHIR Working Group.