XML更新流的XQuery查询  

XQuery query over XML update streams

作　　者：张晓琳[1] 路皓[1] 陈向阳[1] 禇燕华 

机构地区：[1]内蒙古科技大学信息工程学院,内蒙古包头014010

出　　处：《内蒙古科技大学学报》2010年第3期250-253,共4页Journal of Inner Mongolia University of Science and Technology

基　　金：国家社会科学基金资助项目(07XTO003);内蒙古自然科学基金重点资助项目(20080404Zd21)

摘　　要：针对在XML流上执行XQuery查询处理,精确输出查询结果的问题,给出了一种基于XML更新流的解决方案.在XML流中动态地插入更新事件,得到XML更新流,以达到获取连续精确的结果.XQuery查询语言在XPath路径查询的基础上使用FLWOR表达式实现XML数据流的复杂查询.将主Xpath式进行提取,分出绝对路径和相对路径,把有依赖关系的路径进行合并,重写FLWOR表达式,提高XQuery的查询效率.实验结果表明,提出的方法能够提高执行效率,得到精确的查询结果.Aimed at the accepted accurate output query results for the XQuery query over the XML Streams,a solutiion based on XML Streams was presented.Dynamically inserting the update event into the XML Streams,XML update Streams were constructed so that the continuous and precise results were obtained.XQuery query language uses FLOWR expressions to achieve the complexity of queries on XML data streams based on XPath queries.The main path was extracted to separate the absolute path and relative path,the paths with dependency were merged and the FLWOR expression was rewriten to improve the efficiency of XQuery queries.The experimental results show that the proposed method can improve the implementation efficiency and receive precise query results.

关 键 词：XML更新流 XQUERY查询 XPATH 

分 类 号：TP311.13[自动化与计算机技术—计算机软件与理论]