Member Filter

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: ``` "modifierExtension" : [{ "url" : "http://hl7.org/fhir/uv/bulkdata/StructureDefinition/member-filter", "valueExpression" : { "language" : "application/x-fhir-query", "expression" : "Encounter?class=http://terminology.hl7.org/CodeSystem/v3-ActCode|AMB&date=ge2024-01-01&date=le2024-01-31" } }] ```