Stefano Ceri Cristiana Bolchini Daniele Braga Marco Brambilla Alessandro Campi Sara Comai Piero Fraternali Pier Luca Lanzi Marco Masseroli Maristella Matera Mauro Negri Giuseppe Pelagatti Giuseppe Pozzi Elisa Quintarelli Fabio A. Schreiber Letizia Tanca Data and web management research at Politecnico di Milano. 43-48 2007 36 SIGMOD Record 4 http://doi.acm.org/10.1145/1361348.1361359 db/journals/sigmod/sigmod36.html#CeriBBBCCFLMMNPPQST07