"properties": {
                        "errors": {
                            "title": "Errors",
                            "type": "array",
                            "items": {"$ref": "#/components/schemas/Error"},
                        }
                    },
                },
            }
        },

// Hence receivers should use buffered channel so as not to miss the published events.
func (ps *PubSub[T, M]) Publish(item T) {
	ps.RLock()
	defer ps.RUnlock()
	for _, sub := range ps.subs {
		if sub.types.Contains(Mask(item.Mask())) && (sub.filter == nil || sub.filter(item)) {
			select {
			case sub.ch <- item:
			default:
			}
		}
	}
}

// Subscribe - Adds a subscriber to pubsub system

        "<p>text<p>text"                          | "<p>text</p><p>text</p>"
        "<ul><li>text<li>text"                    | "<ul><li>text</li><li>text</li></ul>"
        "<dl><dt>term<dd>item<dt>term<dt>term"    | "<dl><dt>term</dt><dd>item</dd><dt>term</dt><dt>term</dt></dl>"
        "<table><tr><th>cell<tr><td>cell<td>cell" | "<table><tr><th>cell</th></tr><tr><td>cell</td><td>cell</td></tr></table>"

                    "properties": {
                        "errors": {
                            "title": "Errors",
                            "type": "array",
                            "items": {"$ref": "#/components/schemas/Error"},
                        }
                    },
                },
            }
        },

                        <ol class="breadcrumb float-sm-right">
                            <li class="breadcrumb-item"><la:link href="/admin/dict">
                                <la:message key="labels.dict_list_link"/>
                            </la:link></li>
                            <li class="breadcrumb-item"><la:link href="../list/1/?dictId=${f:u(dictId)}">

  // More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.ListMeta metadata = 1;

  // `items` is a list of FlowSchemas.
  repeated FlowSchema items = 2;
}

// FlowSchemaSpec describes how the FlowSchema's specification looks like.
message FlowSchemaSpec {

    context = browser.new_context(viewport={"width": 960, "height": 1080})
    page = context.new_page()
    page.goto("http://localhost:8000/docs")
    page.get_by_role("button", name="Item-Input").click()
    page.get_by_role("button", name="Item-Output").click()
    page.set_viewport_size({"width": 960, "height": 820})
    # Manually add the screenshot
    page.screenshot(

* `externalDocs`: 外部ドキュメントを説明するための `dict`:
    * `description`: 外部ドキュメントの簡単な説明文である `str`。
    * `url` (**必須**): 外部ドキュメントのURLである `str`。

### タグのためのメタデータの作成

`users` と `items` のタグを使った例でメタデータの追加を試してみましょう。

タグのためのメタデータを作成し、それを `openapi_tags` パラメータに渡します。

```Python hl_lines="3-16  18"
{!../../docs_src/metadata/tutorial004.py!}
```

  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.ListMeta metadata = 1;

  // items is the list of groups for discovery. The groups are listed in priority order.
  repeated APIGroupDiscovery items = 2;
}

// APIResourceDiscovery provides information about an API resource for discovery.
message APIResourceDiscovery {

message EndpointSliceList {
  // Standard list metadata.
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.ListMeta metadata = 1;

  // items is the list of endpoint slices
  repeated EndpointSlice items = 2;
}

// ForZone provides information about which zones should consume this endpoint.
message ForZone {
  // name represents the name of the zone.
  optional string name = 1;