【作者】 张硕； 李建中； 熊蜀光； 王春宇；

【机构】 哈尔滨工业大学计算机科学与技术学院；

【摘要】 <正>1引言XML(extensible markup language)是一套定义语义标记的规则,它已经逐渐成为一种新的网上数据交换标准。随着WWW上站点提供的信息越来越多,Web数据管理有待解决很多新的问题。Web数据集成以如何正确有效地集成形式多样的更多还原

【Abstract】 Web Data Integration Systems integrate many diverse data sources.It is a important issue to integrate them efficiently using semi-structured data model,especially XML.Many traditional methods paid more attention to rewriting query using views,optimizing query via materialized views etc.,which didn’t consider the precision of query result and effect on users.Two methods are proposed to overcome these problems.The contributions include (1) a query decomposition strategy to answer queries with most probable result,which decompose query appropriately to return results of largest precision first;(2)a query optimization method to answer multiple queries rapidly with partial results.更多还原