description: This cross-version extension represents EvidenceVariable.characteristic.timeFromStart from http://hl7.org/fhir/StructureDefinition/EvidenceVariable|4.0.1 for use in FHIR R4B.
package_name: hl7.fhir.uv.xver-r4.r4b
derivation: constraint
name: ext_R4_EvidenceVariable_ch_timeFromStart
type: Extension
elements:
  value:
    base: {path: 'Extension.value[x]'}
    short: Observation time from study start
    choices: [valueDuration]
    index: 1
  valueDuration:
    base: {path: 'Extension.value[x]'}
    type: Duration
    short: Observation time from study start
    choiceOf: value
    index: 2
  url:
    pattern: {type: uri, value: 'http://hl7.org/fhir/4.0/StructureDefinition/extension-EvidenceVariable.characteristic.timeFromStart'}
    type: uri
    index: 3
package_version: 0.0.1-snapshot-1
class: extension
kind: complex-type
url: http://hl7.org/fhir/4.0/StructureDefinition/extension-EvidenceVariable.characteristic.timeFromStart
base: http://hl7.org/fhir/StructureDefinition/Extension
version: 0.0.1-snapshot-1
required: [url]