description: This cross-version extension represents Communication.topic from http://hl7.org/fhir/StructureDefinition/Communication|3.0.2 for use in FHIR R5.
package_name: hl7.fhir.uv.xver
derivation: constraint
name: ext_R3_Communication_topic
type: Extension
elements:
  value:
    base: {path: 'Extension.value[x]'}
    short: Focal resources
    choices: [valueReference]
    index: 1
  valueReference:
    short: Focal resources
    refers: ['http://hl7.org/fhir/StructureDefinition/Resource']
    type: Reference
    base: {path: 'Extension.value[x]'}
    choiceOf: value
    index: 2
  url:
    pattern: {type: Uri, value: 'http://hl7.org/fhir/3.0/StructureDefinition/extension-Communication.topic'}
    index: 3
package_version: r3.r5-0.0.1-snapshot-1
class: extension
kind: complex-type
url: http://hl7.org/fhir/3.0/StructureDefinition/extension-Communication.topic
base: http://hl7.org/fhir/StructureDefinition/Extension
version: 0.0.1-snapshot-1
required: [url]