This research topic has emerged as a main focus of many recent conferences and research communities, including computer-human interface, information retrieval, hypertext, databases, and Web. Introduction Hypertext and hypermedia have emerged as primary means for structuring documents and for accessing the Web. With the explosive growth of the WWW, most searches retrieve a large number of documents. The Web has no aggregate structure which organizes distinct localities.
Users have no global view of the entire Web from which to forage for relevant pages.
This research topic has emerged as a main focus of many recent conferences on hypertext and WWW, including the first ACM Digital Library Workshop on Organizing Web Space held in Berkeley, California, USA in August 14, 1999. Although search engines are one of the most popular methods to retrieve information of interest from the Web, they usually return thousands of URLs that match the user-specified query terms. Due to the information overload problem and the mix of useful information and low quality data, it is essential to support filtering and organization functionalities. Many systems and techniques have been proposed to utilize links to determine document associations. Connectivity relationships indicate that two documents are relevant to each other if there are links between them.