This repository is used in the NHS England FHIR Implementation Guide
Information on the IG content spell / link / error checking can be found within the IOPS-FHIR-Test-Scripts repo.
Information on the QualityControlChecker can be within the IOPS-FHIR-Test-Scripts repo.
The CapabilityStatement is used by the validation tool to check which profile to validate against. If no Profile is stated then the base FHIR resource will be used.