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Machiavelli is a polymorphically typed programming language in the spirit of ML, but supports a different type inferencing that makes its polymorphism somewhat more general than that of ML and appropriate for database applications. In particular, a function that selects a field f of a records is polymorphic in the sense that it can be applied to any record which contains a field f with the appropriate type. When combined with a set data type and database operations including join and projection, this provides a natural medium for relational database programming. Moreover, by implementing database objects as reference types and generating the appropriate views - sets of structures with "identity" - we can achieve a degree of static type checking for object-oriented databases.
Atsushi Ohori, Peter Buneman, and Val Tannen, "Database Programming in Machiavelli - A Polymorphic Language With Static Type Inference", . December 1988.
Date Posted: 01 November 2007