This document is about mediation systems integrating services over the Web. First, we give an overview of the mediator approach. In section 3 we focus on integration of services over the Web. We explain which problems arise and we give principles to make the mediator approach applicable in this context. The first principle is a solution to semantic heterogeneity. It exploits results in standardization relative to business transactions. The second principle concerns the scalability of the mediator approach. It emphasizes two points: de-coupling of the various components and strong mediation. In the last section, we present an architecture of a mediation system integrating services, designed in the setting of the PICSEL 2 project. We illustrate with an application of e-commerce in the tourism domain.
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