这段代码生产如下 OpenAPI 概图：

```JSON hl_lines="5-7"
{
    "openapi": "3.0.2",
    // More stuff here
    "servers": [
        {
            "url": "/api/v1"
        },
        {
            "url": "https://stag.example.com",
            "description": "Staging environment"
        },
        {
            "url": "https://prod.example.com",
            "description": "Production environment"
        }
    ],

* a origem
* a sobrescrita
* a carga útil
* o processador
* a propriedade
* o proxy
* o pull request
* a consulta
* a RAM
* a máquina remota
* o código de status
* a string
* a tag
* o framework web
* o curinga
* retornar
* validar

////

//// tab | Informações

//
// returns ErrNone if the signature matches.
func doesPolicySignatureV4Match(formValues http.Header) (auth.Credentials, APIErrorCode) {
	// Server region.
	region := globalSite.Region()

	// Parse credential tag.
	credHeader, s3Err := parseCredentialHeader("Credential="+formValues.Get(xhttp.AmzCredential), region, serviceS3)
	if s3Err != ErrNone {
		return auth.Credentials{}, s3Err
	}

	r := &http.Request{Header: formValues}

因此，在我们的示例中，我们可以将 `tags` 明确地指定为一个「字符串列表」：

{* ../../docs_src/body_nested_models/tutorial002_py310.py hl[12] *}

## Set 类型

但是随后我们考虑了一下，意识到标签不应该重复，它们很大可能会是唯一的字符串。

Python 具有一种特殊的数据类型来保存一组唯一的元素，即 `set`。

然后我们可以导入 `Set` 并将 `tag` 声明为一个由 `str` 组成的 `set`：

{* ../../docs_src/body_nested_models/tutorial003_py310.py hl[12] *}

这样，即使你收到带有重复数据的请求，这些数据也会被转换为一组唯一项。

而且，每当你输出该数据时，即使源数据有重复，它们也将作为一组唯一项输出。

并且还会被相应地标注 / 记录文档。

## 嵌套模型

```JSON hl_lines="5-7"
{
    "openapi": "3.1.0",
    // Más cosas aquí
    "servers": [
        {
            "url": "/api/v1"
        },
        {
            "url": "https://stag.example.com",
            "description": "Staging environment"
        },
        {
            "url": "https://prod.example.com",
            "description": "Production environment"
        }
    ],

labels.storage_file=Arquivo
labels.storage_folder_name=Nome da pasta
labels.storage_button_download=Baixar
labels.storage_button_tags=Tags
labels.storage_title_tag=Tag:
labels.storage_tag_key=Chave da tag
labels.storage_tag_value=Valor da tag
labels.login.newpassword=Você precisa atualizar sua senha
labels.login.placeholder_new_password=Nova senha
labels.login.placeholder_confirm_new_password=Confirmar nova senha

 *
 * <p>For example, an XML escaper would convert the literal string {@code "Foo<Bar>"} into {@code
 * "Foo&lt;Bar&gt;"} to prevent {@code "<Bar>"} from being confused with an XML tag. When the
 * resulting XML document is parsed, the parser API will return this text as the original literal
 * string {@code "Foo<Bar>"}.
 *

# Number of fragments for query highlighting.
query.highlight.number.of.fragments=2
# Type of query highlighting.
query.highlight.type=fvh
# Tag to use before highlighted text.
query.highlight.tag.pre=<strong>
# Tag to use after highlighted text.
query.highlight.tag.post=</strong>
# Boundary characters for query highlighting.
query.highlight.boundary.chars=u0009u000Au0013u0020
# Maximum scan for query highlight boundaries.

* the origin
* the override
* the payload
* the processor
* the property
* the proxy
* the pull request
* the query
* the RAM
* the remote machine
* the status code
* the string
* the tag
* the web framework
* the wildcard
* to return
* to validate

////

//// tab | Info

var legacyXMLName = "SelectObjectContentRequest"

// UnmarshalXML - decodes XML data.
func (s3Select *S3Select) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
	// S3 also supports the older SelectObjectContentRequest tag,
	// though it is no longer found in documentation. This is
	// checked and renamed below to allow older clients to also
	// work.
	if start.Name.Local == legacyXMLName {