The analysis of special pages and text extraction methods in this paper has a practical significance in the research of web information technology and the application of networks.
文中对特殊网页的分析及其文本提取方法的研究，对网页信息挖掘技术研究和网络应用、网络监察具有重要的实际意义。
As the common knowledge of a special domain, ontology could deal with the challenging task in information extraction — the bottleneck of knowledge engineering.
本体作为对领域知识的共同理解，能有效地解决现在信息抽取所面对的主要挑战——知识工程的瓶颈问题。
In order to overcome these problems meta search engines aiming at special requirements appear for information extraction, information filtering and integration of heterogenous information resources.
为了克服搜索引擎的这种缺点，产生了针对某一专门需要，用于信息提取、信息过滤和异构信息源整合的元搜索引擎。
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