La représentation de points de vue dans le système d'aide à la décision en cancérologie KASIMIR

In this paper, we introduce the knowledge representation ba sed on viewpoints on which relies the KASIMIR system, aimed at decision helping in oncology. The design ofview- points is considered on both theoretical and practical leve ls, and takes its place in the range of work on the subject that has a rather long history in the dom ain of object-based knowledge representation systems. From the theoretical side, the vie wpoints are considered within the dis- tributed description logic C-OWL, that allows the explicitrepresentation and manipulation of viewpoints. From the practical side, an operational implem entation of viewpoints in C-OWL within an application in oncology shows how viewpoints are d esigned, and how they can be