Today user-centered information acquisition over collections of complex XML documents is increasingly in demand. To this end, preferences have become an important paradigm enablin...
Whereas search engines assist users in locating initial information sources, often an overwhelmingly large number of ULRs is returned, and the task of browsing websites rests heavi...
The widespread adoption of XML holds out the promise that document structure can be exploited to specify precise database queries. However, the user may have only a limited knowle...
The Internet has changed the way people look for information. Users now expect the answers to their questions to be available through a simple web search. Web search engines are i...
Web search engines often federate many user queries to relevant structured databases. For example, a product related query might be federated to a product database containing thei...