description: Identifies the expansion parameters used when building the IG package_name: hl7.fhir.uv.tools derivation: constraint name: IGExpansionParameters type: Extension elements: extension: {index: 0} url: type: uri pattern: {type: Uri, value: 'http://hl7.org/fhir/tools/StructureDefinition/expansion-parameters'} index: 1 value: choices: [valueReference] index: 3 valueReference: type: Reference choiceOf: value refers: ['http://hl7.org/fhir/StructureDefinition/Parameters'] index: 4 package_version: 1.1.0 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/tools/StructureDefinition/expansion-parameters base: http://hl7.org/fhir/StructureDefinition/Extension version: 1.1.0 required: [valueReference, value]