XML数据上支持查询扩展的关键词检索系统

A Keyword Search System Supporting Query Expansion on XML Data

XML数据上的关键词检索已经成为研究热点,为提高检索效果,查询扩展是常用的方法.提出一个XML数据上支持查询扩展的关键词检索系统,旨在从系统层面更好地支持查询扩展,从而将现有查询扩展技术与关键词检索技术结合起来.本系统主要分为索引构建、检索引擎和数据访问模块.在此基础上实现了XML数据上ELCA条件下的查询扩展检索算法,以支持扩展查询.详细介绍了系统中各部分的实现方法,展示了关键技术和实现细节.该系统为进一步的理论研究和算法应用奠定了基础.

As a user friendly interface,keyword search(KWS)over XML data has been extensively studied in database community.To further improve the quality of keyword search,there is abundant of work which has adopted automated query expansion(AQE).This paper proposes a prototype system for supporting AQE on XML data.The purpose of this system is to provide a platform which can generate search result of expanded queries quickly by combining these two existing techniques. This system consists of three main modules,index builder,searching component,and data accessing component.We design and implement a fast searching algorithm for finding all ELCAs of expanded query.In this paper,we describe the implementation of each part of the system,and show the key technique and details.Furthermore,the proposed system lays a good foundation for future research and applications.