description: This cross-version extension represents VisionPrescription.prescriber from http://hl7.org/fhir/StructureDefinition/VisionPrescription|1.0.2 for use in FHIR R4B. package_name: rs/hl7.fhir.uv.xver derivation: constraint name: ext_R2_VisionPrescription_prescriber type: Extension elements: value: base: {path: 'Extension.value[x]'} short: Who authorizes the vision product choices: [valueReference] index: 1 valueReference: short: Who authorizes the vision product refers: ['http://hl7.org/fhir/StructureDefinition/Practitioner'] type: Reference base: {path: 'Extension.value[x]'} choiceOf: value index: 2 url: pattern: {type: uri, value: 'http://hl7.org/fhir/1.0/StructureDefinition/extension-VisionPrescription.prescriber'} type: uri index: 3 package_version: r2.r4b-0.0.1-snapshot-1 class: extension kind: complex-type url: http://hl7.org/fhir/1.0/StructureDefinition/extension-VisionPrescription.prescriber base: http://hl7.org/fhir/StructureDefinition/Extension version: 0.0.1-snapshot-1 required: [url]