Views of Objects and Rules

Object-oriented database systems provide expressive power and the potential for reuse, extensibility and modifiability. Relational and deductive database systems provide a simple logical semantics and the ability to represent complex derived information. Many proposals have been made for database systems that offer both sets of features, and some combined systems have been implemented. In this paper, I shall review recent work on one particular approach to the problem of designing deductive object-oriented database systems that offer both sets of features. 1 Introduction The field of database systems as a scientific discipline began in 1970 with the publication of Codd's landmark paper on the relational data model [11]. This paper sparked a flurry of research into the theory and implementation of relational database systems, and throughout the 1970's and 1980's, most of the new database systems implemented were relational, as were most of the new database applications. The significanc..