【摘要】 XML已成为事实上的数据表示和数据交换的标准 ,用XML表示的半结构化数据越来越普遍。同时 ,大量的结构化数据组织存放在关系数据库中。如何复合查询这些不同结构的数据 ,成为了当前研究的热点。本文将关系数据源和XML数据源包裹为一个统一类型的数据源 ,并提出了一个查询此数据源的方法更多还原

【Abstract】 XML has been as the standard format to express data and to exchange data in fact ,the semi-structured data expressed with XML has become very common,while great amount of data is stored in relational database.How to query these data which stored with different format has become very important.In this paper,we wrap rel at ional data source and XML data source as data source with an uniform structure,a nd address a way on how query the data source.更多还原