description: Record of the date and/or time of the first exposure to the Substance for this Reaction Event.
package_name: hl7.fhir.r2b.core
derivation: constraint
name: Date(/time) of first exposure to Substance
type: null
elements:
  extension:
    isModifier: false
    name: extension
    mustSupport: false
    maxLength: 0
    base: {max: '0', min: 0, path: Extension.extension}
    isSummary: false
    index: 0
  url:
    isModifier: false
    pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/openEHR-exposureDate'}
    type: uri
    mustSupport: false
    maxLength: 0
    base: {max: '1', min: 0, path: Extension.url}
    isSummary: false
    index: 1
  value:
    base: {max: '1', min: 0, path: 'Extension.value[x]'}
    isSummary: false
    maxLength: 0
    isModifier: false
    mustSupport: false
    choices: [valueDateTime]
    index: 3
  valueDateTime:
    isModifier: false
    index: 4
    type: dateTime
    mustSupport: false
    maxLength: 0
    base: {max: '1', min: 0, path: 'Extension.value[x]'}
    choiceOf: value
    isSummary: false
package_version: 1.4.0
extensions: {}
class: datatype
kind: datatype
url: http://hl7.org/fhir/StructureDefinition/openEHR-exposureDate
base: http://hl7.org/fhir/StructureDefinition/Extension
version: null
required: [valueDateTime, value]