Web信息抽取技术是当今的一个研究热点.目前出现了基于不同原理的多种信息抽取技术,它们具有不同的性能.本文根据信息抽取的原理,对现有的信息抽取技术进行了分类,结合典型的系统,在语义的附加方式、模式的定义方式、规则的表现形式、语义项的定位方式、对象的定位方式等几方面进行了分析和比较,在此基础上提出了待研究的问题.
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