SI-Web: a Web based interface for the MOMIS project
Domenico Beneventano, Sonia Bergamaschi, D. Bianco, Francesco Guerra, Maurizio Vincini · 2002
Abstract. The MOMIS project (Mediator envirOnment for Multiple Information Sources) developed in the past years allows the integration of data from structured and semi-structured data sources. SI-Designer (Source Integrator Designer) is a designer support tool implemented within the MOMIS project for semi-automatic integration of heterogeneous sources schemata. It is a java application where all modules involved are available as CORBA Object and interact using established IDL interfaces. The goal of this demonstration is to present a new tool: SI-Web (Source Integrator on Web), it offers the same features of SI-Designer but it has got the great advantage of being usable on Internet through a web browser. 1. Overview of the MOMIS system Like other integration projects [1,8], MOMIS follows a "semantic approach " to information integration based on the conceptual schema, or metadata, of the information sources, and on the I3 architecture [6] (see Figure 1). The system is composed by the following functional elements that communicates using the CORBA (OMG) standard: • a common data model, ODMI3, which is defined according to the ODLI3 language, to describe source schemas for integration purposes. ODMI3 and ODLI3 have been defined in MOMIS as subset of the corresponding ones in ODMG, following the proposal for a standard mediator language developed by the I3/POB working group [5]. In addition, ODL I3 introduces new constructors to support the semantic integration process; • Wrappers, placed over each sources, translate metadata descriptions of the sources into the common ODL I3 representation, translate (reformulate) a global query expressed in the OQLI3 query language into queries expressed in the sources languages and export query result data set;