description: Extension on Observation to add information whether this is the current estimate (e.g. for term date). package_name: nictiz.fhir.nl.stu3.geboortezorg derivation: constraint name: bc-observation-isCurrent type: Extension elements: url: pattern: {type: Uri, value: 'http://nictiz.nl/fhir/StructureDefinition/bc-observation-isCurrent'} index: 0 package_version: 1.3.3-rc3 class: extension kind: complex-type url: http://nictiz.nl/fhir/StructureDefinition/bc-observation-isCurrent base: http://hl7.org/fhir/StructureDefinition/Extension version: null