description: 'Extension to define the population of the group using FHIR REST API parameters. For example, the following extension would limit the population of the group to patients with an ambulatory encounter in January 2024:\n```\n\"modifierExtension\" : [{\n  \"url\" : \"http://hl7.org/fhir/uv/bulkdata/StructureDefinition/member-filter\",\n  \"valueExpression\" : {\n    \"language\" : \"application/x-fhir-query\",\n      \"expression\" : \"Encounter?class=http://terminology.hl7.org/CodeSystem/v3-ActCode|AMB&date=ge2024-01-01&date=le2024-01-31\"\n  }\n}]\n```'
package_name: hl7.fhir.uv.bulkdata
derivation: constraint
name: MemberFilter
type: Extension
elements:
  extension: {index: 0}
  url:
    pattern: {type: uri, value: 'http://hl7.org/fhir/uv/bulkdata/StructureDefinition/member-filter'}
    type: uri
    index: 1
  value:
    choices: [valueExpression]
    index: 3
  valueExpression: {type: Expression, choiceOf: value, index: 4}
  value[x]:
    elements:
      language:
        pattern: {type: code, value: application/x-fhir-query}
        type: code
        index: 5
package_version: 3.0.0-ballot
extensions: {}
class: extension
kind: complex-type
url: http://hl7.org/fhir/uv/bulkdata/StructureDefinition/member-filter
base: http://hl7.org/fhir/StructureDefinition/Extension
version: 3.0.0-ballot