{description: dateTime 또는 Period 자료형으로 표현된 측정값, package_name: hl7.fhir.kr.core, name: KRCoreSearchParameterObservationValueDate, type: date, package_version: 2.0.0, class: unknown, kind: null, url: 'http://www.hl7korea.or.kr/fhir/krcore/SearchParameter/krcore-sp-observation-value-date', version: 2.0.0}