This paper analyses the current quality problems on the CALIS online cataloguing database, and puts forward measures for controlling the quality of the CALIS online cataloguing database.

通过对CALIS联合目录数据库中重复数据的分析，总结出重复数据的类型和产生重复数据的原因，并提出质量控制对策。

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This article discusses the development tendency of library cataloguing work through online cataloguing, bibliography database market, catalogue outsourcing and so on.

文章分别从联机编目、书目数据库市场、编目业务外包等方面，论述了图书馆编目工作未来的发展趋势。

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