网页变化监测相关技术与方法研究

Research on Web Change Detection

有效的网页变化监测技术可以极大提高地保存的效率，因此网页变化监测研究对网络资源长期保存显得十分必要。文章总结了现有的网页变化特点研究成果，指出了目前所采用的网页监测变化频率选择策略，分析了网页变化检测的技术和方法，并指明其发展面临的困难和挑战。该文为2009年第七期“网络信息资源保存”专题文章之一。

The effective web change detection technology may enhance the efficiency of web archive greatly, so the web change detection is necessary to the web archive. This paper sums up the research of change characteristics of web pages, points out the selection strategy of the web detection frequency, analyzes the technology and method of the web change detection. It aslo indicates the obstacle and challeng during its development.