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\titolo
{A Metamodel Approach to the     %%% Titolo articolo (obbligatorio)
Management of Multiple Models
and the Translations of Schemes} 
{Paolo Atzeni$^1$,               %%% Autori articolo (obbligatorio)
Riccardo Torlone$^2$}        
{RT-DIA-2-96}                    %%% Numero Rapporto Tecnico (obbligatorio)
{Giugno 1996}                    %%% Data (obbligatoria)
{$(1)$ Universit\`a              %%% Affiliazioni (facoltativo se gli autori 
di Roma Tre,\\                   %%% afferiscono tutti al nostro Dipartimento)
Via della Vasca Navale, 79\\
00146 Roma, Italy.\\[5mm]
$(2)$ IASI--CNR,\\ 
Viale Manzoni 30\\
00185 Roma, Italy.}              
{This work was partially         %%% Ringraziamenti & Supporti (facoltativo)
supported by MURST and 
by Pippo, Pluto e Topolino.}     

\sommario                        %%% Abstract (obbligatorio)
{We describe the development of	a tool,	called {\sf MDM}, for the
management of multiple models and the translation of database schemes.  
This tool can be at the basis of an integrated CASE environment, supporting 
the analysis and design of information systems, that allows different 
representations for the same data schemes.

We first present a graph-theoretic framework that allows us to formally 
investigate desirable properties of schema translations. The formalism is 
based on a classification of the constructs used in the known data model 
into a limited set of types. Then, on the basis of formal results, we 
develop general methodologies for deriving ``good'' translations between 
schemes and, more in general, between models.  Finally, we define the 
architecture and the functionalities of a first prototype that implements 
the various features of the approach.
}

\section{Introduction}           %%% Da cui in poi va il resto dell'articolo

bla, bla

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