它们不仅是针对相交区域的索引；叶页(leaf page)面保存数据对象本身。
They are not bounding-box-only indexes; the leaf pages store the data objects themselves.
消息：两个系统连接到一个公用的消息系统，互相交换数据，并利用消息调用行为。
Messaging: two systems connect to a common messaging system and exchange data and invoke behavior using messages.
在这种复合类型中，进行交互的消费者和提供者被看作是对等的伙伴，互相交换数据和控制信号。
In this type of composition, the interacting consumer and provider are viewed as peers, exchanging data and control signals.
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