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[IEEE 2008 IEEE International Conference on Web Services (ICWS) - Beijing, China (2008.09.23-2008.09.26)] 2008 IEEE International Conference on Web Services - A DDL-Based Model for Web Service Composition in Context-Aware EnvironmentNiu, Wenjia; Shi, Zhongzhi; Wan, Changlin; Chang, Liang; Peng, Hui · 2008