ABSTRACT
In this chapter, we first discuss the drawbacks of using the current access control policies in a heterogeneous environment. These heterogeneous environments can contain either relational data or semistructured data in the form of a tree (e.g., XML) or a graph (e.g., the World Wide Web, RDF). We focus mainly on RBAC systems, but the discussion applies equally well to the other access control models. We identify the key drawbacks of access control over provenance by concentrating on a simple case; single data items within a provenance graph. We discuss the reasons why we need flexible policies, which are both dynamic and interoperable, and then present a Semantic Web approach for overcoming these challenges.
