description: Specifies the expansion parameters that should be used to expand the ValueSet, or any ValueSets in the Library (or referenced by components of the Library). package_name: hl7.fhir.uv.extensions.r3 derivation: constraint name: ExpansionParameters type: Extension elements: url: type: uri pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/cqf-expansionParameters'} index: 0 value: choices: [valueReference] index: 2 valueReference: type: Reference choiceOf: value refers: ['http://hl7.org/fhir/StructureDefinition/Parameters'] index: 3 package_version: 5.1.0 class: extension kind: complex-type url: http://hl7.org/fhir/StructureDefinition/cqf-expansionParameters base: http://hl7.org/fhir/StructureDefinition/Extension version: 5.1.0 required: [valueReference, value]