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描述异构数据库的特征、连接和数据交换技术,探讨跨库检索系统应具备的功能和应注意的问题,并介绍国外一些有影响的跨库检索系统。
Describe the features, connections and data exchange technologies of heterogeneous databases, discuss the functions and problems that should be paid attention to, and introduce some influential cross-database retrieval systems in foreign countries.