Dipartimento di Informatica e Scienze dell'Informazione
Very abstract Specifications:
A formalism Independent Approach
M. Cerioli and G. Reggio .
Mathematical Structures in Computer Science. To appear, 1997.
Two operations are presented for a modular approach to the definition
of frameworks for rigorous development of software, formally
represented as institutions.
The first one generalize models, allowing them to have more structure
than the minimal required by their declared signatures, as it happens
for software modules, having local routines that do not appear in
The second one extends sentences, and their interpretation in models,
allowing sentences on richer signatures to be used as formulae for
Combining the application of these operations, powerful institutions
can be defined, like those for very abstract entities, or for
hyper-loose algebraic specifications.
The compatibility of different sequential applications of these
operations and properties of the resulting institutions are studied as
This is an extended version of
Institutions for Very Abstract Specifications
The compressed postscript version of this paper is available through anonymous ftp
at ftp.disi.unige.it, in