#   o schema: (Required: if empty schema means valid schema, not required)
    #   o user: (NotRequired - Default same as main schema)
    #   o password: (NotRequired - Default same as main schema)
    #   o propertiesMap: (NotRequired - Default map:{})
    #   o objectTypeTargetList: (NotRequired - Default list{TABLE;VIEW})
    #
    #; additionalDropMapList = list:{
    #    ; map:{

///

### JSON Schema 的 `examples` 欄位 { #json-schemas-examples-field }

後來 JSON Schema 在新版本規範中新增了 [`examples`](https://json-schema.org/draft/2019-09/json-schema-validation.html#rfc.section.9.5) 欄位。

接著新的 OpenAPI 3.1.0 以最新版本（JSON Schema 2020-12）為基礎，該版本就包含這個新的 `examples` 欄位。

現在這個新的 `examples` 欄位優先於舊的單一（且客製）`example` 欄位，後者已被棄用。

But it was created before there existed Python type hints. So, to define every <dfn title="the definition of how data should be formed">schema</dfn> you need to use specific utils and classes provided by Marshmallow.

/// check | Inspired **FastAPI** to

Use code to define "schemas" that provide data types and validation, automatically.

///

### [Webargs](https://webargs.readthedocs.io/en/latest/) { #webargs }

This schema definition includes your API paths, the possible parameters they take, etc.

#### Data "schema" { #data-schema }

The term "schema" might also refer to the shape of some data, like a JSON content.

In that case, it would mean the JSON attributes, and data types they have, etc.

#### OpenAPI and JSON Schema { #openapi-and-json-schema }

            // sitemaps.xml
            buf = new StringBuilder();
            buf.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>").append('\n');
            buf.append("<urlset ").append("xmlns=\"http://www.sitemaps.org/schemas/sitemap/0.9\">").append('\n');
            buf.append("<url>").append('\n');
            buf.append("<loc>http://localhost:").append(port).append("/index.html</loc>").append('\n');

beta and enabled by default. CustomResourceDefinitions with [structural schemas](https://github.com/kubernetes/enhancements/blob/master/keps/sig-api-machinery/20190425-structural-openapi.md) now publish schemas in the OpenAPI document served at `/openapi/v2`. CustomResourceDefinitions with non-structural schemas have a `NonStructuralSchema` condition added with details about what needs to be corrected in the validation schema. ([#77825](https://github.com/kubernetes/kubernetes/pull/77825), [@royc...

* Automatic data model documentation with [**JSON Schema**](https://json-schema.org/) (as OpenAPI itself is based on JSON Schema).
* Designed around these standards, after a meticulous study. Instead of an afterthought layer on top.
* This also allows using automatic **client code generation** in many languages.

### [Pydantic](https://docs.pydantic.dev/) { #pydantic }

Pydantic 是基於 Python 型別提示，定義資料驗證、序列化與文件（使用 JSON Schema）的函式庫。

這讓它非常直覺。

它可與 Marshmallow 相提並論。儘管在效能測試中它比 Marshmallow 更快。而且因為它基於相同的 Python 型別提示，編輯器支援也很出色。

/// check | **FastAPI** 用於

處理所有資料驗證、資料序列化與自動模型文件（基於 JSON Schema）。

**FastAPI** 接著會把這些 JSON Schema 資料放入 OpenAPI 中，此外還有其他許多功能。

///

### [Starlette](https://www.starlette.dev/) { #starlette }

	cacheStore                *sync.Map
}

func (schema *Schema) String() string {
	if schema.ModelType.Name() == "" {
		return fmt.Sprintf("%s(%s)", schema.Name, schema.Table)
	}
	return fmt.Sprintf("%s.%s", schema.ModelType.PkgPath(), schema.ModelType.Name())
}

func (schema *Schema) MakeSlice() reflect.Value {
	slice := reflect.MakeSlice(reflect.SliceOf(reflect.PointerTo(schema.ModelType)), 0, 20)
	results := reflect.New(slice.Type())

*경로 처리*에서 요청 페이로드와 응답 페이로드에 사용하는 모델을 `Item`, `ResponseMessage` 모델로 정의하고 있다는 점에 주목하세요.

### API 문서 { #api-docs }

`/docs`로 이동하면, 요청으로 보낼 데이터와 응답으로 받을 데이터에 대한 **스키마(schemas)**가 있는 것을 볼 수 있습니다:

<img src="/img/tutorial/generate-clients/image01.png">

이 스키마는 앱에서 모델로 선언되었기 때문에 볼 수 있습니다.

그 정보는 앱의 **OpenAPI 스키마**에서 사용할 수 있고, 이후 API 문서에 표시됩니다.