【摘要】 对信息抽取技术的发展和趋势作了一定分析,并讨论了当前半结构化信息检索领域的先进抽取技术。从应用的角度提出一种新的半结构化信息获取方法。该方法包括网页分析过程、映射的自动生成和信息抽取过程。通过建立标记树来进行网页结构分析,利用实例路径归纳学习出用户需求信息的公共路径,将效用的抽取结果提交用户,减少了用户负担,提高了查全率和查准率,为进一步满足Web信息抽取提供了一种新的高效信息抽取工具。更多还原

【Abstract】 The development of information retrival technology and advanced information retrival technology is analyzed. A new methord of semi-structured information retrival is presented. The improved method includes the process of Web-page analysis, automatic map, information retrival. The Web-page structure analysis is made by using marked-tree, the common path of customer needed information is inductived by sample path. So the burden of customer is lessed and the check rate and accurate rate are improved, and an improved implement of Web information retrival is presented.更多还原