摘要
提出一种多XML数据源的语义集成和查询处理的途径,通过一定步骤将各个局部DTD模式集成为全局模式,同时生成全局模式到局部模式的映射。在查询处理中,查询被表示成查询树的形式,引入了补查询和连接子等概念,给出了查询分解和执行的具体算法,并首次提出并分析了XML集成环境下产生不确定查询结果的情况。
An approach for the semantic integration and query processing of multiple xml data sources is proposed. Local DTDs are integrated into a global schema through several steps,while the mappings from the global schema to the local ones are generated at the same time.A query is represented as a tree,and by introducing the concepts of auxiliary query and joining object,the algorithms for query decomposition and processing are brought out.Finally the problem of indefinite query results in xml data integration is analyzed for the first time in the literature.
出处
《计算机工程与应用》
CSCD
北大核心
2006年第17期167-170,217,共5页
Computer Engineering and Applications
