# References

This guide is based on FHIR R4 (4.0.1) and the SMART Health Links specification.

## FHIR R4

- [FHIR R4 specification](https://hl7.org/fhir/R4/)
- [Observation](https://hl7.org/fhir/R4/observation.html) — granular facts and coded/text/quantitative/boolean results
- [Bundle](https://hl7.org/fhir/R4/bundle.html) — collection packaging and `fullUrl`
- [Device](https://hl7.org/fhir/R4/device.html) — source application identity
- [FHIR JSON representation](https://hl7.org/fhir/R4/json.html)

## Authoring and delivery

- [FHIR Shorthand](https://hl7.org/fhir/uv/shorthand/)
- [SMART Health Links specification](https://build.fhir.org/ig/HL7/smart-health-cards-and-links/links-specification.html)

## Terminology

- [LOINC](https://loinc.org/)
- [SNOMED CT](https://www.snomed.org/)
- [UCUM](https://ucum.org/)

The terminology validation script included with this source kit checks referenced LOINC and SNOMED CT codes against supplied licensed distributions. Implementers remain responsible for the terminology editions and licenses applicable to their deployments.