description: 'empty-behaviour: what should be in JSON when a repeating elements has no items? Can be absent, present, or either' package_name: rs/hl7.fhir.uv.tools.r5 derivation: constraint name: JsonEmptyBehavior type: Extension elements: extension: {index: 0} url: pattern: {type: uri, value: 'http://hl7.org/fhir/tools/StructureDefinition/json-empty-behavior'} type: uri index: 1 value: choices: [valueCode] index: 3 valueCode: {type: code, choiceOf: value, index: 4} package_version: 0.4.1 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/tools/StructureDefinition/json-empty-behavior base: http://hl7.org/fhir/StructureDefinition/Extension version: 0.4.1 required: [value, valueCode]