description: Thes Extension profile supports the definition of expansion parameters for the ValueSet.
package_name: hl7.fhir.us.ph-library
derivation: constraint
name: USPublicHealthExpansionParametersExtension
type: Extension
elements:
  extension: {index: 0}
  url:
    pattern: {type: uri, value: 'http://hl7.org/fhir/us/ph-library/StructureDefinition/us-ph-expansion-parameters-extension'}
    type: uri
    index: 1
  value:
    choices: [valueReference]
    index: 3
  valueReference:
    type: Reference
    choiceOf: value
    refers: ['http://hl7.org/fhir/StructureDefinition/Parameters']
    index: 4
package_version: 2.0.0-ballot
extensions: {}
class: extension
kind: complex-type
url: http://hl7.org/fhir/us/ph-library/StructureDefinition/us-ph-expansion-parameters-extension
base: http://hl7.org/fhir/StructureDefinition/Extension
version: 2.0.0-ballot