Distributed Semantic Query Processing in a Cooperative Information System
John Cardiff, Tiziana Catarci, Giuseppe Santucci · 1995
Visual Query System (VQS) is a suitable interface to a cooperative information system, as its users often have no knowledge of the structure or location of the data. However queries issued through a VQS may be translated into inefficient queries to the component systems, if the semantics of the system are not considered. In this paper, we present the design of a semantic query preprocessor for a cooperative information system. We also introduce a logic language to formally express interdependencies between classes belonging to different schemas. Using these assertions, we may benefit in several ways from the possibility of reasoning about them, including applying them in heterogeneous query processing.