SI-Designer (Source Integrator Designer) is a designer support tool for semi;automatic integration of heterogeneous sources schemata (relational, object and semi;structured sources); it has been implemented within the MOMIS project and it carries out integration following a semantic approach which uses intelligent Description Logics-based techniques, clustering techniques and an extended ODMG-ODL language, ODL I 3 , to represent schemata, extracted, integrated information. Starting from the

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... ces' ODL I 3 descriptions (local schemata) SI-Designer supports the designer in the creation of an integrated view of all the sources (global schema) which is expressed in the same ODL I 3 language. We propose SI-Designer as a tool to build virtual catalogs in the E-Commerce environment.