异构数据源集成应用模型及其查询处理方法

Integration Application Model of Heterogeneous Data Sources and Query Processing

异构数据源联合使用的目的是屏蔽数据源的异构性，提供给用户一个使用多种数据源的统一接口，在实现联合使用的系统中的难点是用户查询的重写和分解。该文介绍了基于半结构化数据模型的异构数据源联合使用的实现，描述了其中的查询重写和查询分解的方法。

The goal of integration application of heterogeneous data sources is to shield the heterogeneity and provide a uniform interface using multi-data sources. The query processing is a key element in the integration system. This paper introduces an integration system model based on semi-structured data model, and describes the method of query rewriting and decomposition.