description: This cross-version extension represents CapabilityStatement.acceptUnknown from http://hl7.org/fhir/StructureDefinition/CapabilityStatement|3.0.2 for use in FHIR R4. package_name: hl7.fhir.uv.xver-r3.r4 derivation: constraint name: ext_R3_CapabilityStatement_acceptUnknown type: Extension elements: value: base: {path: 'Extension.value[x]'} short: no | extensions | elements | both choices: [valueCode] index: 1 valueCode: base: {path: 'Extension.value[x]'} type: code short: no | extensions | elements | both choiceOf: value index: 2 url: pattern: {type: uri, value: 'http://hl7.org/fhir/3.0/StructureDefinition/extension-CapabilityStatement.acceptUnknown'} 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-CapabilityStatement.acceptUnknown base: http://hl7.org/fhir/StructureDefinition/Extension version: 0.0.1-snapshot-1 required: [url]