description: This cross-version extension represents ActivityDefinition.dynamicValue.expression from http://hl7.org/fhir/StructureDefinition/ActivityDefinition|3.0.2 for use in FHIR R4B. package_name: hl7.fhir.uv.xver-r3.r4b derivation: constraint name: ext_R3_ActivityDefinition_dy_expression type: Extension elements: value: base: {path: 'Extension.value[x]'} short: An expression that provides the dynamic value for the customization choices: [valueString] index: 1 valueString: base: {path: 'Extension.value[x]'} type: string short: An expression that provides the dynamic value for the customization choiceOf: value index: 2 url: pattern: {type: uri, value: 'http://hl7.org/fhir/3.0/StructureDefinition/extension-ActivityDefinition.dynamicValue.expression'} type: uri index: 3 package_version: 0.0.1-snapshot-1 class: extension kind: complex-type url: http://hl7.org/fhir/3.0/StructureDefinition/extension-ActivityDefinition.dynamicValue.expression base: http://hl7.org/fhir/StructureDefinition/Extension version: 0.0.1-snapshot-1 required: [url]