SingleMessage
case class SingleMessage(headers: Option[ReferenceOr[Schema]], payload: Option[Either[AnyValue, ReferenceOr[Schema]]], correlationId: Option[ReferenceOr[Schema]], schemaFormat: Option[String], contentType: Option[String], name: Option[String], title: Option[String], summary: Option[String], description: Option[String], tags: List[Tag], externalDocs: Option[ExternalDocumentation], bindings: List[MessageBinding], examples: List[Map[String, List[ExampleValue]]], traits: List[ReferenceOr[MessageTrait]], extensions: ListMap[String, ExtensionValue]) extends Message