Mashup Pubs publication categorizer

We introduce a formal model for capturing the notion of mashup in its globality. The basic component in our model is the mashlet. A mashlet may query data sources, import other mashlets, use external Web services, and specify complex interaction patterns between its components. A mashlet state is modeled by a set of relations and its logic specified by datalog-style active rules. We are primarily concerned with changes in a mashlet state relations and rules.