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A high-level data-base system, the Peterlee Relational Test Vehicle (PRTV), provides flexible, interactive data-base support and functional extensibility. The user sees the system primarily through a programming language called ISBL, which is designed for manipulating bulk data held in relations. PRTV is not a full-fledged data-base system, but rather an evolving prototype which is expected to aid in solving some of the problems that have been encountered in using relational data bases. PRTV embodies research both in data-base language design and in efficient implementation techniques.
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