description: This cross-version extension represents PlanDefinition.asNeeded[x] from http://hl7.org/fhir/StructureDefinition/PlanDefinition|5.0.0 for use in FHIR R4. package_name: hl7.fhir.uv.xver-r5.r4 derivation: constraint name: ext_R5_PlanDefinition_asNeeded type: Extension elements: value: base: {path: 'Extension.value[x]'} short: Preconditions for service choices: [valueBoolean, valueCodeableConcept] index: 1 valueBoolean: base: {path: 'Extension.value[x]'} type: boolean short: Preconditions for service choiceOf: value index: 2 valueCodeableConcept: base: {path: 'Extension.value[x]'} type: CodeableConcept short: Preconditions for service choiceOf: value index: 3 url: pattern: {type: uri, value: 'http://hl7.org/fhir/5.0/StructureDefinition/extension-PlanDefinition.asNeeded'} type: uri index: 4 package_version: 0.0.1-snapshot-1 class: extension kind: complex-type url: http://hl7.org/fhir/5.0/StructureDefinition/extension-PlanDefinition.asNeeded base: http://hl7.org/fhir/StructureDefinition/Extension version: 0.0.1-snapshot-1 required: [url]