Visual Rule Language for ActiveDatabase

This paper introduces a visual language for active database systems. We present a new approach to database programming based on visual active language that allows us to describe active rules in a graphical way. The resulting visual language can be transformed into a textual one. In addition, an active system can be represented with several diierent graphs showing the interactions of rules and transactions. These graphs can be used by a database designer for programming, analysis, debugging and maintenance of the system. Indeed, they can be used to visualise the dynamic behaviour of an active database under either immediate or deferred semantics. In order to test our approach we have implemented a prototype of the resulting visual programming tool that is brieey discussed.