Petri-net-oriented economic early warning service composite model

Aiming at solving the problems of economic early warning system,such as the difficulty of model integration,model management and model reuse,and the unsatisfactory effect of single early warning model,this paper has proposed a web service model of economic early warning system based on Petri-net.This model adopted service-oriented architecture and published early warning components by web service.We applied a standardized interface to make each component cooperate with each other.We presented an algorithm mapping the early warning model to Petri-net,which was able to complete complex early warning application through services composition.Moreover,we discussed the system construction method and key technologies for dynamic web services composition.The results show that a composite service composed by Petri-net can insure the reachability,safeness,accuracy and boundness of the model.