description: Specifies a query or other expression that identifies the resource (or set of resources for a repeating item) that should be used to support the population of this Questionnaire or Questionnaire.item on initial population.  When populating the questionnaire, it will set the specified variable name to that resource repetition for use in processing items within the group.
package_name: hl7.fhir.uv.sdc.r4b
derivation: constraint
name: ItemPopulationContextExtension
type: Extension
elements:
  url:
    type: uri
    pattern: {type: Uri, value: 'http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-itemPopulationContext'}
    index: 0
  value:
    choices: [valueExpression]
    index: 2
  valueExpression: {type: Expression, choiceOf: value, index: 3}
package_version: 3.0.0
class: extension
kind: complex-type
url: http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-itemPopulationContext
base: http://hl7.org/fhir/StructureDefinition/Extension
version: 3.0.0