Monitoring Web information changes

Often Web users want to be notified when specific information contained in a Web page has been modified. The problem of detecting Web document changes has been deeply investigated and several systems providing notification of Web page changes are available. These systems do not provide notification of changes on specific information contained in a Web page. In this work we present a system called CDWeb that performs this task. It allows users to monitor a whole document or specific portions of it. Users can also specify what kind of changes they are interested in, such as structural changes, or semantic changes. The system provides a flexible and adaptive view of the Web: it tracks user queries and creates user profiles, in order to associate a personalized view to each user