To restrict the contents of the collection, requiring specific topic types or roles at specified positions within the collection.
限制集合的内容，要求在集合中的特定位置出现特定的主题类型或者角色。
For example, destination type (queue or topic) can be specified here.
例如，可在这里指定目的类型(队列或主题)。
For example, a message published at QoS 2 to a subscriber that specified QoS 1 for that topic is delivered at QoS 1.
例如，以QoS2向订阅者发布的消息，若订阅者指定此主题的级别为QoS1，那么主题就会以QoS 1传递。
A notification is generated, and sent to the NotificationConsumer specified in the subscription for this topic.
生成通知，并发送至该主题的订阅中指定的NotificationConsumer中。
The event has no connection information specified; that is, the event is sent directly to Business Events event topic.
事件没有特定的连接信息，这就是说，事件直接被发送到BusinessEvents事件主题。
Displays the contents of the Help file found at the specified URL for a specific topic.
显示特定主题在指定url中找到的说明档内容。
Displays the contents of the Help file found at the specified URL for a specific topic.
显示特定主题在指定url中找到的说明档内容。
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