http://hl7.org/fhir/StructureDefinition/timing-exact|4.0.1

If true, indicates that the specified times, frequencies, periods are expected to be adhered to as precisely as possible. If false, indicates that a typical degree of variability based on institutional and/or patient convenience is acceptable.
element_idtypes
Extension
Extension.extension
Extension.url
Extension.value[x]
Extension
Extension.id
Extension.extension
Extension.url
Extension.value[x]