description: Base StructureDefinition for Period Type package_name: hl7.fhir.core derivation: specialization name: Period type: Period elements: start: {short: Starting time with inclusive boundary, comments: 'If the low element is missing, the meaning is that the low boundary is not known.', type: dateTime, isSummary: true, index: 0} end: {short: 'End time with inclusive boundary, if not ongoing', comments: 'The high value includes any matching date/time. i.e. 2012-02-03T10:00:00 is in a period that has a end value of 2012-02-03.', type: dateTime, meaningWhenMissing: 'If the end of the period is missing, it means that the period is ongoing', isSummary: true, index: 1} package_version: 1.8.0 class: complex-type kind: complex-type url: http://hl7.org/fhir/StructureDefinition/Period base: http://hl7.org/fhir/StructureDefinition/Element version: null