Subscription filter allows subscriber to define a list of topics that a notification consumer is interested in.
订阅筛选器，允许订阅器定义通知使用者感兴趣的主题列表。
It is usually best to pass a filter during registration, even if the current implementation only emits a certain type of notification.
通常，最好是在注册过程中来传递过滤器，即使当前实现只发出某种特定类型的通知。
If the filter evaluates to true, you send a notification to the patient indicating medication compliance.
如果过滤器被计算为true，您将向患者发送一条通知，说明他的服药情况。
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