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This paper describes a graphical interface to an experimental database system which incorporates a built-in version control mechanism that maintains a history of the database development and changes. The system is an extension of ISIS , Interface for a Semantic Information System, a workstationbased, graphical database programming tool developed at Brown University. ISIS supports a graphical interface to a modified subset of the Semantic Data Model (SDM)  . The ISIS extension introduces adoi:10.1145/214427.214430 fatcat:lgyltmuovvfmvbdjr4xrm53w2a