Smalltalk-80: the language and its implementation
Smalltalk-80: the language and its implementation
Object oriented database systems and knowledge systems
Proceedings from the first international workshop on Expert database systems
Constraint management in expert database systems
Proceedings from the first international workshop on Expert database systems
A database management system based on an object-oriented model
Proceedings from the first international workshop on Expert database systems
Making smalltalk a database system
SIGMOD '84 Proceedings of the 1984 ACM SIGMOD international conference on Management of data
Model instantiation for query driven simulation in active KDL
ANSS '90 Proceedings of the 23rd annual symposium on Simulation
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In this report we discuss ongoing research in the area of object-oriented database systems at the CWI. The central theme of this paper is the friction encountered when using an object-oriented (O-O) language, such as Smalltalk, in the database arena. A series of (open) database issues is given for which the object-oriented paradigm does not provide an elegant solution. A refinement of the O-O concepts is given which emphasizes the dynamic classification of objects through its characteristic properties. Our approach is illustrated by a description of the object-centered database language Godel and its use. A central language concept is the guardian, which is a high-level declarative description of a process which algorithmically reacts to states and to state changes of an object base. A prototype implementation of Godel has been implemented in C-Prolog.