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Service-based systems have many applications, such as collaborative research and development, e-business, health care, military applications, and homeland security. In dynamic service-oriented computing environment, situation awareness (SAW) is needed for system status monitoring, adaptive service coordination and flexible security policy enforcement. Furthermore, various application software systems in such environments often need to reuse situational information for providing better qualitydoi:10.1109/compsac.2006.30 dblp:conf/compsac/YauGHGZ06 fatcat:hy25qxekdrgqpet2v4lxdqeljy