description: An extension to carry the service instructions for an eRS health care service. package_name: uk.nhsdigital.r4.test derivation: constraint name: ExtensioneRSServiceInstructions type: Extension elements: url: pattern: {type: Uri, value: 'https://fhir.nhs.uk/StructureDefinition/Extension-eRS-ServiceInstructions'} index: 0 value: short: The service instructions for an eRS health care service choices: [valueString] index: 2 valueString: {type: string, short: The service instructions for an eRS health care service, choiceOf: value, index: 3} package_version: 2.8.8-prerelease class: extension kind: complex-type url: https://fhir.nhs.uk/StructureDefinition/Extension-eRS-ServiceInstructions base: http://hl7.org/fhir/StructureDefinition/Extension version: 1.0.0 required: [valueString, value]