description: 'R4: `EvidenceVariable.characteristic.definition[x]` additional types (DataRequirement, TriggerDefinition)'
package_name: hl7.fhir.uv.xver-r4.r4b
derivation: constraint
name: ExtensionEvidenceVariable_Characteristic_Definition
type: Extension
elements:
  url:
    base: {max: '1', min: 1, path: Extension.url}
    pattern: {type: Uri, value: 'http://hl7.org/fhir/4.0/StructureDefinition/extension-EvidenceVariable.characteristic.definition'}
    index: 0
  value:
    base: {max: '1', min: 0, path: 'Extension.value[x]'}
    short: What code or expression defines members?
    choices: [valueDataRequirement, valueTriggerDefinition]
    index: 2
  valueDataRequirement:
    short: What code or expression defines members?
    type: DataRequirement
    base: {max: '1', min: 0, path: 'Extension.value[x]'}
    choiceOf: value
    index: 3
  valueTriggerDefinition:
    short: What code or expression defines members?
    type: TriggerDefinition
    base: {max: '1', min: 0, path: 'Extension.value[x]'}
    choiceOf: value
    index: 4
package_version: 0.1.0
class: extension
kind: complex-type
url: http://hl7.org/fhir/4.0/StructureDefinition/extension-EvidenceVariable.characteristic.definition
base: http://hl7.org/fhir/StructureDefinition/Extension|4.3.0
version: 0.1.0
required: [url, valueTriggerDefinition, valueDataRequirement, value]