description: Record of the date and/or time of the first exposure to the Substance for this Reaction Event.
package_name: hl7.fhir.r4b.core
derivation: constraint
name: exposureDate
type: Extension
elements:
  extension: {index: 0}
  url:
    pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/openEHR-exposureDate'}
    index: 1
  value:
    choices: [valueDateTime]
    index: 3
  valueDateTime: {type: dateTime, choiceOf: value, index: 4}
package_version: 4.1.0
extensions: {}
class: extension
kind: complex-type
url: http://hl7.org/fhir/StructureDefinition/openEHR-exposureDate
base: http://hl7.org/fhir/StructureDefinition/Extension
version: 4.1.0
required: [valueDateTime, value]