采用标准消息的形式进行通信，对有关查询或查询响应的信息进行编码。
Communications take the form of a standard message that encodes information about a query, or a response to a query.
比如，可以缓存地图数据来减少响应时间，但通常并不适合将搜索查询结果或者实时交通信息进行缓存。
For instance, it makes sense to cache map data to reduce response time, but it's often impossible or impractical to cache results of search queries or real-time traffic information.
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