description: This cross-version extension represents Measure.group.population.criteria from http://hl7.org/fhir/StructureDefinition/Measure|3.0.2 for use in FHIR R4. package_name: hl7.fhir.uv.xver-r3.r4 derivation: constraint name: Ext_R3_Measure_gr_po_criteria type: Extension elements: url: base: {max: '1', min: 1, path: Extension.url} pattern: {type: Uri, value: 'http://hl7.org/fhir/3.0/StructureDefinition/extension-Measure.group.population.criteria'} index: 0 value: base: {max: '1', min: 0, path: 'Extension.value[x]'} short: The name of a valid referenced CQL expression (may be namespaced) that defines this population criteria choices: [valueString] index: 2 valueString: base: {max: '1', min: 0, path: 'Extension.value[x]'} type: string short: The name of a valid referenced CQL expression (may be namespaced) that defines this population criteria choiceOf: value index: 3 package_version: 0.0.1-snapshot-2 class: extension kind: complex-type url: http://hl7.org/fhir/3.0/StructureDefinition/extension-Measure.group.population.criteria base: http://hl7.org/fhir/StructureDefinition/Extension|4.0.1 version: 0.0.1-snapshot-2 required: [url]