The interface has three methods, all of them intended to receive warning and error notifications.
该接口有三个方法，这三个方法都用来接收警告和错误通知。
It specifies an interface for a consumer to subscribe, filter notifications, and manage subscriptions and an interface for publishers to send notifications.
它为使用者指定一个用于订阅、筛选通知和管理订阅的接口，并为发布者指定一个用于发送通知的接口。
The example shown here included an interface for subscribing on a presence entity and receiving notifications when attributes associated with the presence entity change.
本文给出的示例提供了一个接口，用于在状态实体上进行订阅，并在与状态实体相关的属性发生变化时接收通知。
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