From: Anthony Cleve
To:
Date: Mon, 28 Nov 2005 11:34:55 +0100
Subject: SEM announcement - Wednesday 30, 14.00

Dear all,

On Wednesday November 30, 2005- 14.00, room M279 - I will have the 
pleasure to give a presentation about the current state of my internship.

The (tentative) title of the talk is "Database Applications Evolution 
using Co-transformations".
Here is the abstract :
Database Applications Evolution can be seen as a chain of coupled 
transformations. These transformations concern three different sorts of 
mutually dependent artifacts, namely schemas, data instances, and 
programs. When the applications evolves, the consistency that exists 
between these three artifacts must be preserved. The problem we try to 
solve can be summarized as follows: how can a change in a database 
schema be propagated to the application programs manipulating its data 
instances?

In this talk we will present our approach that consists in associating 
to each kind of (semantics-preserving) schema transformations the 
corresponding program modification mappings. In order to specify 
DMS-independent transformation rules, we have defined a semi-predicative 
data manipulation language (LDA or ADL). Our (prototype) propagation 
tool takes as input the history log of all the transformations 
successively applied to the source schema in order to obtain the target 
schema (TS) and reestablish the consistency between the TS and the 
concerned LDA programs. We will also present and demonstrate other 
related tools:
 - a consistency checker for LDA programs
 - a prototype SQL2LDA/LDA2SQL translator.

Looking forward to seeing you then !

Best regards,
Anthony