return p
	}
	return ""
}

// Tags - a rule can either have tag under <filter></filter> or under
// <filter><and></and></filter>. This method returns all the tags from the
// rule in the format tag1=value1&tag2=value2
func (r Rule) Tags() string {
	if !r.Filter.Tag.IsEmpty() {
		return r.Filter.Tag.String()
	}
	if len(r.Filter.And.Tags) != 0 {
		var buf bytes.Buffer

	chacha20Poly1305ID = "******@****.***"
	gcm256CipherID     = "******@****.***"
	aes128cbcID        = "aes128-cbc"
	tripledescbcID     = "3des-cbc"
)

// https://cs.opensource.google/go/x/crypto/+/refs/tags/v0.22.0:ssh/common.go;l=46
// preferredKexAlgos specifies the default preference for key-exchange
// algorithms in preference order. The diffie-hellman-group16-sha512 algorithm

```

この設定では、自動APIドキュメントは以下の様になります:

<img src="/img/tutorial/metadata/image01.png">

## タグのためのメタデータ

さらに、パラメータ `openapi_tags` を使うと、path operations をグループ分けするための複数のタグに関するメタデータを追加できます。

それぞれのタグ毎にひとつの辞書を含むリストをとります。

それぞれの辞書は以下をもつことができます:

* `name` (**必須**): *path operations* および `APIRouter` の `tags` パラメーターで使用するのと同じタグ名である `str`。
* `description`: タグの簡単な説明文である `str`。 Markdownで記述でき、ドキュメントUIに表示されます。
* `externalDocs`: 外部ドキュメントを説明するための `dict`:

## Dokumentations-Tags – OpenAPI

Um Tags zu Ihren *Pfadoperationen* hinzuzufügen und diese in der Oberfläche der Dokumentation zu gruppieren, lesen Sie die Dokumentation unter [Tutorial – Pfadoperation-Konfiguration – Tags](../tutorial/path-operation-configuration.md#tags){.internal-link target=_blank}.

## Zusammenfassung und Beschreibung in der Dokumentation – OpenAPI

      this.method = request.method
      this.body = request.body
      this.tags =
        when {
          request.tags.isEmpty() -> mapOf()
          else -> request.tags.toMutableMap()
        }
      this.headers = request.headers.newBuilder()
      this.cacheUrlOverride = request.cacheUrlOverride
    }

    open fun url(url: HttpUrl): Builder =
      apply {
        this.url = url
      }

	cmd := &cobra.Command{
		Use:   "tag",
		Short: "Command group used to interact with revision tags",
		Long: `Command group used to interact with revision tags. Revision tags allow for the creation of mutable aliases
referring to control plane revisions for sidecar injection.

With revision tags, rather than relabeling a namespace from "istio.io/rev=revision-a" to "istio.io/rev=revision-b" to

from fastapi import APIRouter

router = APIRouter()


@router.get("/users/", tags=["users"])
async def read_users():
    return [{"username": "Rick"}, {"username": "Morty"}]


@router.get("/users/me", tags=["users"])
async def read_user_me():
    return {"username": "fakecurrentuser"}


@router.get("/users/{username}", tags=["users"])
async def read_user(username: str):

		entry.API.TimeToResponseInNS = strconv.FormatInt(timeToResponse.Nanoseconds(), 10)
		// We hold the lock, so we cannot call reqInfo.GetTagsMap().
		tags := make(map[string]interface{}, len(reqInfo.tags))
		for _, t := range reqInfo.tags {
			tags[t.Key] = t.Val
		}
		entry.Tags = tags
		// ignore cases for ttfb when its zero.
		if timeToFirstByte != 0 {

func TestTestTags(t *testing.T) {
	noTags := Filter{
		set: true,
		And: And{
			Tags: []Tag{},
		},
		andSet: true,
	}

	oneTag := Filter{
		set: true,
		And: And{
			Tags: []Tag{{Key: "FOO", Value: "1"}},
		},
		andSet: true,
	}

	twoTags := Filter{
		set: true,
		And: And{
			Tags: []Tag{{Key: "FOO", Value: "1"}, {Key: "BAR", Value: "2"}},
		},
		andSet: true,
	}

    description: Union[str, None] = None
    price: Union[float, None] = None
    tax: float = 10.5
    tags: list[str] = []


items = {
    "foo": {"name": "Foo", "price": 50.2},
    "bar": {"name": "Bar", "description": "The bartenders", "price": 62, "tax": 20.2},
    "baz": {"name": "Baz", "description": None, "price": 50.2, "tax": 10.5, "tags": []},
}


@app.get("/items/{item_id}", response_model=Item)