The wide range and irregularity of Internet makes it difficult to retrieve professional information . In this paper, professional information collection is divided into 3 layers, which are index layer, navigation database layer and entity layer. These layers refine information better with the deepening of the process,it will provide all-sided, exact and abundant information resource based on the WWW.
孟海滨,伍瑞昌. Internet专业领域信息资源的分层获取技术研究[J]. 现代图书情报技术, 2002, 18(6): 59-60.
Meng Haibin,Wu Ruichang. Research on Professional Information Collection on Internet by Layered Method. New Technology of Library and Information Service, 2002, 18(6): 59-60.