【摘要】 异构数据源集成过程中所面对的首要问题是异构问题,包括系统异构、模式异构和语义异构三个。以W3C的XML Schema标准作为异构数据源的全局模式,借助XML Schema强的数据描述能力,通过实现关系模式的提取、关系模式到XML Schema的转化和附加语义约束,实现了异构数据源的集成。更多还原

【Abstract】 Heterogeneity,structure and semantic relation extension are the main challenge in the process of Integrating Heterogeneous Database. To solve these problems we define a directed-graph data model as the common data model and propose a integration approach base on XML Schema which capture the full structure and Semantic constraints in relation schema, translates into the global XML schema representations and merges the result through adding semantic content constraints.更多还原