On the mapping path composed of connecting schema mappings, queries are reformulated and forwarded for multiple times to achieve data sharing among multiple data sources.
查询在连接的模式映射组成的映射路径上，通过多次重写转发实现多数据源的数据共享。
On the mapping path composed of connecting schema mappings, queries are reformulated and forwarded for multiple times to achieve data sharing among multiple data sources.
查询在连接的模式映射组成的映射路径上，通过多次重写转发实现多数据源的数据共享。
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