抽取Web信息的包装器归纳学习构造

Wrapper Induction Generation for Extracting the Web Infomation

开发Web信息集成系统的关键是为需集成的各个Web信息源构造包装器。鉴于存在的HTLR类包装器对需抽取信息的Web页限制过严，影响了其表达能力，该文扩展了HTLR，提出了DHTLR类包装器的概念和归纳学习构造算法，较HTLR增强了表达能力，能适用于更广泛的信息源。

The key component in the Web information integration system is the wrapper construction for each Web sites needed. To deal with this problem that existing HTLR class of wrapper is too restrict to the Web pages extracted and narrow the applicability, this paper extends the HTLR wrapper, presenting the DHTLR class of wrapper and the induction generation algorithm. The DHTLR wrapper improves the HTLR wrapper , so its more applicable and can be used in more Web sites.