final StringBuilder buf = new StringBuilder(100);
        buf.append(form.q);
        if (!form.fields.isEmpty() && form.fields.containsKey(LABEL_FIELD)) {
            final String[] values = form.fields.get(LABEL_FIELD);
            final List<String> labelList = new ArrayList<>();
            if (values != null) {
                Collections.addAll(labelList, values);

```

その追加情報はそのまま出力され、JSON Schemaに追加されます。

## `Field`の追加引数

後述する`Field`、`Path`、`Query`、`Body`などでは、任意の引数を関数に渡すことでJSON Schemaの追加情報を宣言することもできます:

```Python hl_lines="4 10 11 12 13"
{!../../docs_src/schema_extra_example/tutorial002.py!}
```

/// warning | "注意"

これらの追加引数が渡されても、文書化のためのバリデーションは追加されず、注釈だけが追加されることを覚えておいてください。

///

## `Body`の追加引数

追加情報を`Field`に渡すのと同じように、`Path`、`Query`、`Body`などでも同じことができます。

	public static final field DISCONNECT_DURING_RESPONSE_BODY Lokhttp3/mockwebserver/SocketPolicy;
	public static final field DO_NOT_READ_REQUEST_BODY Lokhttp3/mockwebserver/SocketPolicy;
	public static final field EXPECT_CONTINUE Lokhttp3/mockwebserver/SocketPolicy;
	public static final field FAIL_HANDSHAKE Lokhttp3/mockwebserver/SocketPolicy;
	public static final field KEEP_OPEN Lokhttp3/mockwebserver/SocketPolicy;

                    "type": "missing",
                    "loc": ["body", "grant_type"],
                    "msg": "Field required",
                    "input": None,
                },
                {
                    "type": "missing",
                    "loc": ["body", "username"],
                    "msg": "Field required",
                    "input": None,
                },
                {

	public static final field INSTANCE Lmockwebserver3/SocketPolicy$DisconnectAtStart;
}

public final class mockwebserver3/SocketPolicy$DisconnectDuringRequestBody : mockwebserver3/SocketPolicy {
	public static final field INSTANCE Lmockwebserver3/SocketPolicy$DisconnectDuringRequestBody;
}

public final class mockwebserver3/SocketPolicy$DisconnectDuringResponseBody : mockwebserver3/SocketPolicy {

    }

    @Override
    public Field getField() {
        return field;
    }

    /**
     * プロパティとして認識しているpublicフィールドを設定します。
     *
     * @param field
     *            プロパティとして認識するpublicフィールド
     */
    public void setField(final Field field) {
        this.field = field;
        if (field != null && ModifierUtil.isPublic(field)) {
            readable = true;

            {
                "type": "missing",
                "loc": ["body", "username"],
                "msg": "Field required",
                "input": {},
            },
            {
                "type": "missing",
                "loc": ["body", "password"],
                "msg": "Field required",
                "input": {},
            },
        ]
    }


@needs_pydanticv2
@needs_py39

from typing import Union

from fastapi import FastAPI
from pydantic import BaseModel, Field

app = FastAPI()


class Item(BaseModel):
    name: str = Field(examples=["Foo"])
    description: Union[str, None] = Field(default=None, examples=["A very nice Item"])
    price: float = Field(examples=[35.4])
    tax: Union[float, None] = Field(default=None, examples=[3.2])


@app.put("/items/{item_id}")

            Pydantic's `include` parameter, passed to Pydantic models to set the
            fields to include.
            """
        ),
    ] = None,
    exclude: Annotated[
        Optional[IncEx],
        Doc(
            """
            Pydantic's `exclude` parameter, passed to Pydantic models to set the
            fields to exclude.
            """
        ),
    ] = None,
    by_alias: Annotated[

  // It is machine-readable.
  // This field cannot be empty for new Events.
  optional string type = 11;

  // deprecatedSource is the deprecated field assuring backward compatibility with core.v1 Event type.
  // +optional
  optional k8s.io.api.core.v1.EventSource deprecatedSource = 12;

  // deprecatedFirstTimestamp is the deprecated field assuring backward compatibility with core.v1 Event type.
  // +optional