Responding with knowledge

ABSTR4CT: By using their knowledge bases, expert database systems can respond to queries that involve high level, complex concepts. However, the answers provided by these systems are composed entirely of low level facts. Recently, researchers have been developing query answer-ing systems that include knowledge in their answers. While the specific goal and approach of each of these individual efforts may be different, all share one common purpose: to extend the functionality of database systems and improve the usefulness of their answers. This paper re-views the state of the art in knowledge-rich responses, and the open problems that still need to be addressed. 1