Résumé en anglais

Work on multiscale issues presents countless challenges that have been long attacked by GIScience researchers. Most results either concentrate on modeling or on data structures/database aspects. Solutions go either towards generalization (and/or virtualization of distinct scales) or towards linking entities of interest across scales. However, researchers seldom take into account the fact that multiscale scenarios are increasingly constructed cooperatively, and require distinct perspectives of the world. The combination of multiscale and multiple perspectives per scale constitutes what we call multifocus research. This paper presents our solution to these issues. It builds upon a specific database version model – the multiversion MVBD – which has already been successfully implemented in several geospatial scenarios, being extended here to support multi-focus research.