Frederico Lopes,  Nélio Cacho,  Thais Batista. 

This paper presents a composite event mechanism (CES) that works in conjunction with more that one publish-subscribe system simultaneously And offers a language with a set of operators to the definition of composite events. Moreover, the paper presents the use of CES to resolve concurrent exceptions in context-aware systems.

http://www.lbd.dcc.ufmg.br:8080/colecoes/sbes/2007/SBES11.pdf

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