Twelve theses on reactive rules for the Web

Abstract. Reactivity, the ability to detect and react to events, is an essential functionality in many information systems. In particular, Web systems such as online marketplaces, adaptive (e.g., recommender) sys-tems, and Web services, react to events such as Web page updates or data posted to a server. This article investigates issues of relevance in designing high-level pro-gramming languages dedicated to reactivity on the Web. It presents twelve theses on features desirable for a language of reactive rules tuned to programming Web and Semantic Web applications.