Some classes of multilevel relational structures
PODS '86 Proceedings of the fifth ACM SIGACT-SIGMOD symposium on Principles of database systems
Database theory—past and future
PODS '87 Proceedings of the sixth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
ACM Transactions on Database Systems (TODS)
Update semantics of relational views
ACM Transactions on Database Systems (TODS)
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A knowledge base is consistent if all its data, information, or knowledge (regardless they are stored in database or implied by inference engine) satisfy the predefined constraints which represent a real world rules or restrictions. Maintaining knowledge consistency in an object-oriented knowledge base is difficult since (i) two data items in the knowledge base may have the relationship that is not explicitly represented by the inheritance; and (ii) logic programming trends to manipulate "flat" data. In contrast, it is easier to develp a mechanism for maintaining the consistency in a value-oriented system (e.g., relational database or logic programming) [Ullm87].