If the application calls for integration with additional servers (either local or remote), further mechanisms for exchanging data between the various subsystems will be required.
如果应用程序调用与其它服务器(本地或远程)的集成，我们将需要用于在不同子系统之间交换数据的更深层次的机制。
QF (Query Framework) - internal libraries for infrastructure and integration of metadata queries, data queries, local data processing, and result sets.
QF (Query Framework) -用于元数据查询、数据查询、本地数据处理和结果集的内部库。
Schema matching is a basic problem in the field of data integration, the main aspect of it concerns a match between global schema and local schema.
而模式匹配是数据集成领域中一个基本的问题，它主要考虑全局模式和局部模式之间的匹配。
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