description: This cross-version extension represents Observation.subject from http://hl7.org/fhir/StructureDefinition/Observation|4.0.1 for use in FHIR R5.
package_name: rs/hl7.fhir.uv.xver
derivation: constraint
name: ext_R4_Observation_subject
type: Extension
elements:
  url:
    pattern: {type: uri, value: 'http://hl7.org/fhir/4.0/StructureDefinition/extension-Observation.subject'}
    type: uri
    index: 0
package_version: r4.r5-0.0.1-snapshot-1
class: extension
kind: complex-type
url: http://hl7.org/fhir/4.0/StructureDefinition/extension-Observation.subject
base: http://hl7.org/fhir/StructureDefinition/Extension
version: 0.0.1-snapshot-1
required: [url]