description: Specifies the anchor date for the effective period as defined by a starting date and a range.
package_name: hl7.fhir.us.cqfmeasures
derivation: constraint
name: PopulationBasis
type: Extension
elements:
  url:
    type: uri
    pattern: {type: Uri, value: 'http://hl7.org/fhir/us/cqfmeasures/StructureDefinition/cqfm-effectivePeriodAnchor'}
    index: 0
  value:
    choices: [valueDateTime]
    index: 2
  valueDateTime: {type: dateTime, choiceOf: value, index: 3}
package_version: 1.1.0
class: extension
kind: complex-type
url: http://hl7.org/fhir/us/cqfmeasures/StructureDefinition/cqfm-effectivePeriodAnchor
base: http://hl7.org/fhir/StructureDefinition/Extension
version: 1.1.0