From Databases to Knowledge-Bases - Kappa, Quixote, Helios

In the FGCS project and its Follow-on project, we have designed and developed a nested relational database management system, Kappa, a deductive objectoriented database (DOOD) language (or a knowledge representation language), QUIXOT E, and a heterogeneous distributed cooperative problem solving system, Helios, for knowledge information processing applications. In this paper, from the viewpoint of database and knowledge-base management systems, I overview their objectives and features, and summarize their contributions. Especially. I focus mainly on their language aspects rather than systems. Further, by reflecting their experiences, I discuss some directions of future database from an application point of view. 1 Introduction In the FGCS (Fifth Generation Computer Systems, 1982-1993) project[Kurozumi 92] and its Follow-on project (1993-1995)[Uchida et al 93], we have been engaged in various knowledge information processing applications such as natural language processing, genetic in..