description: This cross-version extension represents MedicationRequest.instantiatesCanonical from http://hl7.org/fhir/StructureDefinition/MedicationRequest|4.0.1 for use in FHIR R5. package_name: hl7.fhir.uv.xver-r4.r5 derivation: constraint name: Ext_R4_MedicationRequest_instantiatesCanonical type: Extension elements: url: base: {max: '1', min: 1, path: Extension.url} pattern: {type: Uri, value: 'http://hl7.org/fhir/4.0/StructureDefinition/extension-MedicationRequest.instantiatesCanonical'} index: 0 value: base: {max: '1', min: 0, path: 'Extension.value[x]'} short: Instantiates FHIR protocol or definition choices: [valueCanonical] index: 2 valueCanonical: base: {max: '1', min: 0, path: 'Extension.value[x]'} type: canonical short: Instantiates FHIR protocol or definition choiceOf: value index: 3 package_version: 0.0.1-snapshot-2 class: extension kind: complex-type url: http://hl7.org/fhir/4.0/StructureDefinition/extension-MedicationRequest.instantiatesCanonical base: http://hl7.org/fhir/StructureDefinition/Extension|5.0.0 version: 0.0.1-snapshot-2 required: [url]