如果协调者节点不能识别正确的节点，那么它会将查询广播给所有节点，然后聚集它从这些节点那里收到的响应。
If the coordinator node is unable to identify the correct node, it broadcasts the query to all nodes, and then coalesces the responses it receives from them.
定制的聚集器使用这种元数据来提供某些具体的功能，例如创建导航节点的图标、更改移动设备的标题。
This metadata may be used by a customized aggregator to provide certain specialized functions, such as ICONS to represent navigation nodes, alternate titles for mobile devices.
如果在固定的时间内没有找到聚集，则边缘节点自动成为聚集。
Edge-peer automatically becomes rendezvous if no rendezvous were found after fixed time.
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