A new perspective on rule support for object-oriented databases
SIGMOD '93 Proceedings of the 1993 ACM SIGMOD international conference on Management of data
Snoop: an expressive event specification language for active databases
Data & Knowledge Engineering
Adaptive push-pull: disseminating dynamic web data
Proceedings of the 10th international conference on World Wide Web
Monitoring XML data on the Web
SIGMOD '01 Proceedings of the 2001 ACM SIGMOD international conference on Management of data
Information Monitoring on the Web: A Scalable Solution
World Wide Web
Detecting and Representing Relevant Web Deltas Using Web Join
ICDCS '00 Proceedings of the The 20th International Conference on Distributed Computing Systems ( ICDCS 2000)
WebVigiL: user profile-based change detection for HTML/XML documents
BNCOD'03 Proceedings of the 20th British national conference on Databases
A dataflow approach to efficient change detection of HTML/XML documents in WebVigiL
Computer Networks: The International Journal of Computer and Telecommunications Networking - Web dynamics
An exploration of web-based monitoring: implications for design
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
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The World Wide Web is an omni-present and an ever-expanding source of data. Data on the web is constantly increasing and changing. Many a times, users are interested in specific changes to the data on the web. Currently, in order to detect changes of interest, users have to poll the pages periodically and check for the changes of interest. WebVigiL is a general-purpose information monitoring and notification system. It handles the specification, intelligent fetch, detection, and propagation of changes as requested by a user while meeting the quality of service requirements. We use the active capability in the form of event-condition-action (ECA) rules, and a combination of push/pull paradigm for change monitoring. In this paper, we present an overview of the specification language and the run time management of sentinels. We discuss in detail the use of ECA rules for fetching and the adaptive learning algorithm used for fetching pages. We conclude with the implementation status of WebVigiL.