Types, Subtypes, and ASL+

An overview of the low-level specification language ASL+ is given, including a type-checking system and semantics. ASL+ is a formalism for specification and programming in-the-large, based on an arbitrary institution. Its main feature is higher-order paramterisation, allowing parameterised specifications, parameterised programs, and specifications of parameterised programs.
David Aspinall.
Types, Subtypes and ASL+.
In Recent Trends in Data Type Specification, E. Astesiano, G. Reggio and A. Tarlecki (Eds). Springer LNCS 906, 1995.
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David R. Aspinall, email david.aspinall@ed.ac.uk.
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