When researching a topic, users often need different kinds of information which are provided by different information sources. In developing the SINGLESOURCE application, we are building a framework for accessing multiple sources, both for querying several sources simultaneously and viewing the results in a hierarchy of related documents. We first discuss our approach to querying multiple sourc...

We witness a rapid increase in the number of structured information sources that are available online, especially on the WWW. These sources store interrelated data on topics such as product information, stock market information, entertainment , etc. We would like to use the data stored in these databases to answer complex queries that go beyond keyword searches. We describe the Information Mani...