A XML-based composite event approach
Gang Xu, MA Jian-Gang, Tao Huang · 2005
Content-based Pub/sub system offers a convenient abstraction for information producers and consumers, supporting a large-scale system design and evolution by integrating several distributed independent application systems. However, existing content-based Pub/Sub systems mainly focus on the "one-to-one" event matching, not on the composite event matching. The composite event matching enables application components to express more interest in the occurrence of event composite patterns. In this paper, we present a XML-based composite event model that consists of the temporal logical model and the event composite pattern. Based on the composite event model, a subscription language (EXML-QL) is introduced by extending XML-QL language to support the XML-based composite event computing. Finally, according to the peculiarities of the subscription language, a composite event matching algorithm is presented and analyzed.