description: Additional constraints on US Core Provenance to ensure it meets payer needs, including indicating when the event occurred and retaining signatures if present package_name: hl7.fhir.us.davinci derivation: constraint name: HRexProvenance type: Provenance elements: target: index: 0 elements: reference: mustSupport: true index: 1 elements: value: {mustSupport: true, index: 2} required: [value] required: [reference] occurred: mustSupport: true choices: [] index: 4 signature: {mustSupport: true, index: 5} package_version: hrex-1.0.0 class: profile kind: resource url: http://hl7.org/fhir/us/davinci-hrex/StructureDefinition/hrex-provenance base: http://hl7.org/fhir/us/core/StructureDefinition/us-core-provenance version: 1.0.0