1. Context

On July 22, 2000, Bill Gates presented Microsoft's new strategic direction under the code name .NET. At the heart of this strategy is a development platform: the .NET Framework, which enables the creation and execution of modern applications designed around Internet standards (XML, SOAP, WSDL, HTTP). By relying on open standards, enabling interoperability with other platforms such as J2EE [1], CCM [2] and Web services [3], Microsoft is entering a major turning point in the software market.

In August 2000, Microsoft submitted two specifications to ECMA International (European Association for standardizing information and communication systems) to standardize certain aspects of .NET. The first of these specifications concerns the CLI (Common Language Infrastructure). CLI is the heart of .NET. It brings together a set of concepts such as :

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