Dynamic composing Web Services provides an efficient mechanism to offer complex large systems. Substantial progress has already been made towards composing Web Services. Unfortunately, these approaches cannot build a model of the whole life cycle of composed Web Services. In order to solve this problem, we designed a model named Service-Cloud model based on the forming picture of clouds in nature. Service-Cloud model can describe the whole life cycle of the composed web Services: discovery, compose, publish, and terminate. Based on Service-Cloud model, we also designed and implemented a prototype.
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