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

////

## `examples` in JSON Schema - OpenAPI

When using any of:

* `Path()`
* `Query()`
* `Header()`
* `Cookie()`
* `Body()`
* `Form()`
* `File()`

you can also declare a group of `examples` with additional information that will be added to their **JSON Schemas** inside of **OpenAPI**.

</p>
<p align="center">
    FastAPI framework, hiệu năng cao, dễ học, dễ code, sẵn sàng để tạo ra sản phẩm
</p>
<p align="center">
<a href="https://github.com/fastapi/fastapi/actions?query=workflow%3ATest+event%3Apush+branch%3Amaster" target="_blank">
    <img src="https://github.com/fastapi/fastapi/workflows/Test/badge.svg?event=push&branch=master" alt="Test">
</a>

def write_log(message: str):
    with open("log.txt", mode="a") as log:
        log.write(message)


def get_query(background_tasks: BackgroundTasks, q: Union[str, None] = None):
    if q:
        message = f"found query: {q}\n"
        background_tasks.add_task(write_log, message)
    return q


@app.post("/send-notification/{email}")
async def send_notification(

import org.apache.maven.artifact.Artifact;
import org.apache.maven.artifact.repository.ArtifactRepository;
import org.apache.maven.artifact.versioning.ArtifactVersion;

/**
 * Provides some metadata operations, like querying the remote repository for a list of versions available for an
 * artifact.
 *
 */
@Deprecated
public interface ArtifactMetadataSource {

     * so that it may be included in the list of results. IOW we do
     * not want to create a new NbtAddress object for this particular
     * address from which the query is constructed, we want to populate
     * the data of the existing address that should be one of several
     * returned by the node status.
     */

    NodeStatusResponse( NbtAddress queryAddress ) {

                                "required": True,
                                "schema": {"title": "X", "type": "number"},
                                "name": "x",
                                "in": "query",
                            }
                        ],
                        "responses": {
                            "200": {
                                "description": "Successful Response",

                                "type": "boolean",
                                "default": False,
                            },
                            "name": "teleport",
                            "in": "query",
                        }
                    ],
                    "responses": {
                        "200": {
                            "description": "Successful Response",

        RenderDataUtil.register(data, "keyMatchItems", keyMatchService.getKeyMatchList(keyMatchPager)); // page navi

        // restore from pager
        copyBeanToBean(keyMatchPager, form, op -> op.include("term", "query"));
    }

    // ===================================================================================
    //                                                                        Edit Execute

        "options": [],
        "query": "query_result(sum(istio_requests_total) by (destination_workload_namespace) or sum(istio_tcp_sent_bytes_total) by (destination_workload_namespace))",
        "refresh": 1,
        "regex": "/.*_namespace=\"([^\"]*).*/",
        "skipUrlSync": false,
        "sort": 0,
        "tagValuesQuery": "",
        "tagsQuery": "",
        "type": "query",
        "useTags": false
      },

                                    "items": {"type": "string"},
                                }
                            ),
                            "name": "q",
                            "in": "query",
                        }
                    ],
                }
            }
        },
        "components": {
            "schemas": {
                "ValidationError": {