Writing secure code is something most developers know little about. As a result, software vulnerabilities are quite common. We postulate that, by isolating security as a separate concern, this problem can be al-

In the development of agent applications, interactions are an important issue, which must be faced with appropriate methodologies and tools. A separation of concerns between the agents and their interaction needs is helpful in the designing and the implementation phases of the life cycle. In this paper we propose XRole, a system that helps in dealing with interactions. It is based on the defini...