ABSTRACT
View-based access control solutions have been developed for centralized scenarios, but they can be adapted to also operate in distributed database systems. However, when the diversity of the providers involved and their views is considerable and dynamic, view-based access control approaches are result limiting, since they require an explicitly de ned view for each possible access need. is aspect is particularly critical in distributed scenarios, where interorganizational collaborations occur on a daily basis, and where the heterogeneity of the providers and their access restrictions can be high.
