http://hl7.org/fhir/StructureDefinition/operationdefinition-allowed-type|5.2.0

description: When the base type is an abstract type (e.g. Resource or Element) then this extension defines which concrete types are allowed to be used for a parameter. In the absence of this extension, any type is allowed. Replaced by OperationDefinition.parameter.allowedType in R5+
derivation: constraint
name: AllowedType
type: Extension
elements:
  extension: {index: 0}
  url:
    pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/operationdefinition-allowed-type'}
    index: 1
  value:
    choices: []
    index: 3
extensions: {}
class: extension
kind: complex-type
url: http://hl7.org/fhir/StructureDefinition/operationdefinition-allowed-type
base: http://hl7.org/fhir/StructureDefinition/Extension
version: 5.2.0
required: [value]