介绍信息抽取领域的发展。第2.1.节比较了信息抽取和信息检索的区别；第2.2.节介绍IE的历史。接下来两节解释评价IE系统的指标和常用的两派技术方法。信息抽取技术所处理的文本类型将在第2.5.节中说明。第2.6.节描述信息抽取技术可利用的网

Packet : 网上信息抽取技术纵览.doc filelist

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