http://hl7.org/fhir/StructureDefinition/measurereport-countQuantity|5.2.0

Size of the population as a quantity.

element_id	types
Extension
Extension.url	uri
Extension.value[x]	Quantity
Extension
Extension.id	http://hl7.org/fhirpath/System.String
Extension.extension	Extension
Extension.url	uri
Extension.value[x]	Quantity