description: For attachment answers, indicates the maximum size in bytes an attachment can be. package_name: rs/hl7.fhir.uv.extensions.r4 derivation: constraint name: MaxSize type: Extension elements: extension: {index: 0} url: pattern: {type: uri, value: 'http://hl7.org/fhir/StructureDefinition/maxSize'} type: uri index: 1 value: choices: [valueDecimal] index: 3 valueDecimal: {type: decimal, choiceOf: value, index: 4} package_version: 1.0.0 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/StructureDefinition/maxSize base: http://hl7.org/fhir/StructureDefinition/Extension version: 1.0.0 required: [value, valueDecimal]