Modeling the mashup space

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. The interactions with users and other applications, as well as the consequent effects on the mashlets composition and behavior, are captured by streams of changes. The model facilitates dynamic mashlets composition, interaction and reuse, and captures the fundamental behavioral aspects of mashups.

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